Observation of interlayer plasmon polaron in graphene/WS2 heterostructures.

Harnessing electronic excitations involving coherent coupling to bosonic modes is essential for the design and control of emergent phenomena in quantum materials. In situations where charge carriers induce a lattice distortion due to the electron-phonon interaction, the conducting states get "dressed", which leads to the formation of polaronic quasiparticles. The exploration of polaronic effects on low-energy excitations is in its infancy in two-dimensional materials. Here, we present the discovery of an interlayer plasmon polaron in heterostructures composed of graphene on top of single-layer WS2. By using micro-focused angle-resolved photoemission spectroscopy during in situ doping of the top graphene layer, we observe a strong quasiparticle peak accompanied by several carrier density-dependent shake-off replicas around the single-layer WS2 conduction band minimum. Our results are explained by an effective many-body model in terms of a coupling between single-layer WS2 conduction electrons and an interlayer plasmon mode. It is important to take into account the presence of such interlayer collective modes, as they have profound consequences for the electronic and optical properties of heterostructures that are routinely explored in many device architectures involving 2D transition metal dichalcogenides.

'Better see a doctor?' Status quo of symptom checker apps in Germany: A cross-sectional survey with a mixed-methods design (CHECK.APP).

Background: Symptom checker apps (SCAs) offer symptom classification and low-threshold self-triage for laypeople. They are already in use despite their poor accuracy and concerns that they may negatively affect primary care. This study assesses the extent to which SCAs are used by medical laypeople in Germany and which software is most popular. We examined associations between satisfaction with the general practitioner (GP) and SCA use as well as the number of GP visits and SCA use. Furthermore, we assessed the reasons for intentional non-use. Methods: We conducted a survey comprising standardised and open-ended questions. Quantitative data were weighted, and open-ended responses were examined using thematic analysis. Results: This study included 850 participants. The SCA usage rate was 8%, and approximately 50% of SCA non-users were uninterested in trying SCAs. The most commonly used SCAs were NetDoktor and Ada. Surprisingly, SCAs were most frequently used in the age group of 51-55 years. No significant associations were found between SCA usage and satisfaction with the GP or the number of GP visits and SCA usage. Thematic analysis revealed skepticism regarding the results and recommendations of SCAs and discrepancies between users' requirements and the features of apps. Conclusion: SCAs are still widely unknown in the German population and have been sparsely used so far. Many participants were not interested in trying SCAs, and we found no positive or negative associations of SCAs and primary care.

"That's just Future Medicine" - a qualitative study on users' experiences of symptom checker apps.

BACKGROUND: Symptom checker apps (SCAs) are mobile or online applications for lay people that usually have two main functions: symptom analysis and recommendations. SCAs ask users questions about their symptoms via a chatbot, give a list with possible causes, and provide a recommendation, such as seeing a physician. However, it is unclear whether the actual performance of a SCA corresponds to the users' experiences. This qualitative study investigates the subjective perspectives of SCA users to close the empirical gap identified in the literature and answers the following main research question: How do individuals (healthy users and patients) experience the usage of SCA, including their attitudes, expectations, motivations, and concerns regarding their SCA use? METHODS: A qualitative interview study was chosen to clarify the relatively unknown experience of SCA use. Semi-structured qualitative interviews with SCA users were carried out by two researchers in tandem via video call. Qualitative content analysis was selected as methodology for the data analysis. RESULTS: Fifteen interviews with SCA users were conducted and seven main categories identified: (1) Attitudes towards findings and recommendations, (2) Communication, (3) Contact with physicians, (4) Expectations (prior to use), (5) Motivations, (6) Risks, and (7) SCA-use for others. CONCLUSIONS: The aspects identified in the analysis emphasise the specific perspective of SCA users and, at the same time, the immense scope of different experiences. Moreover, the study reveals ethical issues, such as relational aspects, that are often overlooked in debates on mHealth. Both empirical and ethical research is more needed, as the awareness of the subjective experience of those affected is an essential component in the responsible development and implementation of health apps such as SCA. TRIAL REGISTRATION: German Clinical Trials Register (DRKS): DRKS00022465. 07/08/2020.

Only the anxious ones? Identifying characteristics of symptom checker app users: a cross-sectional survey.

BACKGROUND: Symptom checker applications (SCAs) may help laypeople classify their symptoms and receive recommendations on medically appropriate actions. Further research is necessary to estimate the influence of user characteristics, attitudes and (e)health-related competencies. OBJECTIVE: The objective of this study is to identify meaningful predictors for SCA use considering user characteristics. METHODS: An explorative cross-sectional survey was conducted to investigate German citizens' demographics, eHealth literacy, hypochondria, self-efficacy, and affinity for technology using German language-validated questionnaires. A total of 869 participants were eligible for inclusion in the study. As n = 67 SCA users were assessed and matched 1:1 with non-users, a sample of n = 134 participants were assessed in the main analysis. A four-step analysis was conducted involving explorative predictor selection, model comparisons, and parameter estimates for selected predictors, including sensitivity and post hoc analyses. RESULTS: Hypochondria and self-efficacy were identified as meaningful predictors of SCA use. Hypochondria showed a consistent and significant effect across all analyses OR: 1.24-1.26 (95% CI: 1.1-1.4). Self-efficacy OR: 0.64-0.93 (95% CI: 0.3-1.4) showed inconsistent and nonsignificant results, leaving its role in SCA use unclear. Over half of the SCA users in our sample met the classification for hypochondria (cut-off on the WI of 5). CONCLUSIONS: Hypochondria has emerged as a significant predictor of SCA use with a consistently stable effect, yet according to the literature, individuals with this trait may be less likely to benefit from SCA despite their greater likelihood of using it. These users could be further unsettled by risk-averse triage and unlikely but serious diagnosis suggestions. TRIAL REGISTRATION: The study was registered in the German Clinical Trials Register (DRKS) DRKS00022465, DERR1- https://doi.org/10.2196/34026 .

[Learning from Errors: Qualitative Analysis of Expert Reports on Malpractice in Family Medicine]. / Aus Fehlern lernen ­ qualitative Analyse von Gutachten zu hausärztlichen Behandlungsfehlern.

BACKGROUND: Expert committees of the German medical associations provide a free and out-of-court evaluation of putative cases of medical malpractice. They prepare reports that contain valuable information on process steps that precede the actual treatment error. The aim of the present study was to identify and systematically categorize individual process steps in the expert reports and thus to lay the foundations for the understanding of malpractice evaluation processes. METHODS: In this study, ten randomly selected and anonymized expert reports of the Expert Committee for Questions of Medical Liability of the District Medical Association of South Württemberg with identified GP treatment errors were evaluated, using the method of qualitative content analysis. In an iterative process, central elements of expert reports were classified into a deductively and inductively built category system. RESULTS: Six main categories with associated subcategories were identified: 1) structural aspects of the report, 2) doctor-patient communication, 3) medical course, 4) patient's experience, 5) action by the GP team, and 6) coordinative role in the health care system. The category system showed sufficient reliability with repeated use. CONCLUSION: This study offers an opportunity to learn from errors. The proposed system allows to structure the complexity of expert reports on GP malpractice and may thus serve as a tool in various contexts. In particular, it facilitates the preparation and comparative analysis of reports in a structured way. It could also be used in health care research as well as in education and training.

'Hold the course(s)!' - a qualitative interview study of the impact of pandemic-triggered contact restrictions on online instruction in community-based family medicine teaching.

The COVID-19 pandemic has been identified as a catalyst for the digitalization of medical education. Less is known about the specific impact of the pandemic on decentralized, community-based education, such as in General Practitioner practices. The aim of this study is to understand the impact of the digital transformation process, triggered by the COVID-19 pandemic. As, family medicine courses involve both university-based and community-based teaching, this study focuses the mode and quality of instruction and instructors in family medicine teaching. A qualitative interview study was conducted. The participants (N = 12) of a multi-perspective Quality Circle in family medicine teaching were interviewed twice: first, in 2019, about digitalization in family medicine teaching in Tübingen, Germany, not yet aware of the global changes and local transformation that would take place shortly thereafter. Second, in a follow-up interview in 2020 about the transition process and digitalization following the impact of contact restrictions during the pandemic. Grounded Theory was used as a qualitative research approach to analyze the complex processes surrounding this transformation. By analyzing the interviews with various stakeholders of community and university-based teaching, a model for the digital transformation process of family medicine teaching at the University of Tübingen in response to an external stimulus (the pandemic) was developed. It involves six chronological steps: "The calm before the storm," "The storm hits," "All hands on deck," "Adrift," "Reset course," and "The silver lining." This model seeks to understand the process of digital transformation and its impact on the teaching institution (medical faculty of the University of Tübingen, Institute for General Practice and Interprofessional Health Care) and instructors from an integrated perspective and thereby critically revisits prior concepts and opinions on the digitalization of medical teaching. Insights gained are presented as key messages.

Layer-Dependent Interaction Effects in the Electronic Structure of Twisted Bilayer Graphene Devices.

Near the magic angle, strong correlations drive many intriguing phases in twisted bilayer graphene (tBG) including unconventional superconductivity and chern insulation. Whether correlations can tune symmetry breaking phases in tBG at intermediate (≳ 2°) twist angles remains an open fundamental question. Here, using ARPES, we study the effects of many-body interactions and displacement field on the band structure of tBG devices at an intermediate (3°) twist angle. We observe a layer- and doping-dependent renormalization of bands at the K points that is qualitatively consistent with moiré models of the Hartree-Fock interaction. We provide evidence of correlation-enhanced inversion symmetry-breaking, manifested by gaps at the Dirac points that are tunable with doping. These results suggest that electronic interactions play a significant role in the physics of tBG even at intermediate twist angles and present a new pathway toward engineering band structure and symmetry-breaking phases in moiré heterostructures.

Implementing interprofessional video consultations with general practitioners and psychiatrists in correctional facilities in Germany: results from a mixed-methods study.

BACKGROUND: Adequate health care in correctional facilities is often limited by staff shortage, which entails time-consuming consultations with physicians outside of these facilities. Video consultations (VC) have been implemented in many different health care settings and may also be useful in correctional facilities. As part of a pilot project, synchronous VC were implemented in five correctional facilities in Germany in June 2018. The aim of this study was to describe the implementation process from the providers' perspective and to identify factors promoting or inhibiting the implementation process of VC with a focus on interprofessional collaboration between nursing staff and telemedicine physicians. METHODS: As part of the mixed-methods evaluation of the pilot project, site visits to the five correctional facilities were carried out. Nursing staff from the five correctional facilities (n=49) and telemedicine physicians (n=10) were asked to participate in interviews and a questionnaire survey. Interviews were analyzed using qualitative content analysis and questionnaires were evaluated using descriptive statistical methods. The results from both data sources were integrated and discussed in the framework of Normalization Process Theory. RESULTS: Interviews were conducted with 24.5% (n=12) of nursing staff and 20.0% (n=2) of telemedicine physicians, while questionnaires were returned by 22.5% (n=11) of nursing staff and 33.3% (n=3) of telemedicine physicians. VC with general practitioners and psychiatrists were perceived as an additional support during times when physicians were absent from the correctional facilities. Allocating telemedicine physicians to specific correctional facilities might further improve interprofessional collaboration with nursing staff during VC. Inhibiting factors comprised the lack of integrating nursing staff into the implementation process, increased workload, insufficient training and the implementation of VC at an inconvenient time. CONCLUSIONS: To summarize, VC are a promising supplement to face-to-face health care in correctional facilities despite several limitations. These might be compensated by improving interprofessional cooperation and by integrating telemedicine physicians into local health care teams.

Stakeholder Participation and Cross-Sectoral Cooperation in a Quality Circle on Community-Based Teaching: Results of a Qualitative Interview Study.

Introduction: Community-based learning in family medicine practices is an increasingly important part of the medical curriculum internationally. It is widely regarded as one solution to healthcare system needs, such as training and retaining a workforce willing to work in primary care. However, the perspectives of community-based medical educators and representatives from university-based medical education are rarely integrated. To improve teaching quality and promote exchange between those two sectors of medical education, the Institute for General Practice and Interprofessional Care at Tübingen University started a quality circle in family medicine teaching involving stakeholders from both sectors in 2018. The study aims to describe how the participants of this specific QC describe the cross-sectoral cooperation and participation of stakeholders in the quality management of community and university medical education. Methods: After an observed meeting of the quality circle, semi-structured interviews were conducted with n=12 participants of the quality circle. Interview transcripts were analyzed using grounded theory. Results: According to the participants, the quality circle provides a dynamic continuity which allows participants to navigate known barriers to transsectoral collaboration in the quality management of community-based medical education. The quality circle is perceived as an instrument for quality improvement that offered continuity and direction. At the same time, it allows for enough freedom and flexibility for the involved stakeholders to creatively work together on quality management and be inspired by their experiences. Discussion: The quality circle has the potential to facilitate collaboration between the two teaching settings, form a creative community, and give medical students an active role in educational quality management.

Nanoscale View of Engineered Massive Dirac Quasiparticles in Lithographic Superstructures.

Massive Dirac fermions are low-energy electronic excitations characterized by a hyperbolic band dispersion. They play a central role in several emerging physical phenomena such as topological phase transitions, anomalous Hall effects, and superconductivity. This work demonstrates that massive Dirac fermions can be controllably induced by lithographically patterning superstructures of nanoscale holes in a graphene device. Their band dispersion is systematically visualized using angle-resolved photoemission spectroscopy with nanoscale spatial resolution. A linear scaling of effective mass with feature sizes is reported, underlining the Dirac nature of the superstructures. In situ electrostatic doping dramatically enhances the effective hole mass and leads to the direct observation of an electronic band gap that results in a peak-to-peak band separation of 0.64 ± 0.03 eV, which is shown via first-principles calculations to be strongly renormalized by carrier-induced screening. The methodology demonstrates band structure engineering guided by directly viewing structurally and electrically tunable massive Dirac quasiparticles in lithographic superstructures at the nanoscale.

Ethical, legal, and social aspects of symptom checker applications: a scoping review.

Symptom Checker Applications (SCA) are mobile applications often designed for the end-user to assist with symptom assessment and self-triage. SCA are meant to provide the user with easily accessible information about their own health conditions. However, SCA raise questions regarding ethical, legal, and social aspects (ELSA), for example, regarding fair access to this new technology. The aim of this scoping review is to identify the ELSA of SCA in the scientific literature. A scoping review was conducted to identify the ELSA of SCA. Ten databases (e.g., Web of Science and PubMed) were used. Studies on SCA that address ELSA, written in English or German, were included in the review. The ELSA of SCA were extracted and synthesized using qualitative content analysis. A total of 25,061 references were identified, of which 39 were included in the analysis. The identified aspects were allotted to three main categories: (1) Technology; (2) Individual Level; and (3) Healthcare system. The results show that there are controversial debates in the literature on the ethical and social challenges of SCA usage. Furthermore, the debates are characterised by a lack of a specific legal perspective and empirical data. The review provides an overview on the spectrum of ELSA regarding SCA. It offers guidance to stakeholders in the healthcare system, for example, patients, healthcare professionals, and insurance providers and could be used in future empirical research to investigate the perspectives of those affected, such as users.

Feedback in family medicine clerkships: a qualitative interview study of stakeholders in community-based teaching.

Feedback is an important aspect of teaching and learning in medical education. Irrespective of the training environment, too little effective dialogic feedback occurs. Community-based outpatient learning environments, such as general practitioner practices, have heterogeneous framework conditions regarding feedback that decrease feedback quality. To improve feedback in this setting, characteristics of feedback in such learning environments must be considered. This study aims to reveal such characteristics from different perspectives and derive ideas for improving feedback in community-based learning environments. Three stakeholder groups in family medicine clerkships as an example of community-based learning environments (n = 15 students, n = 12 faculty and administrative staff, n = 13 general physician trainers) were interviewed for this study. Transcripts of the interviews were analysed with qualitative content analysis. All stakeholders interviewed note a lack of feedback between groups. Feedback in primary care practices takes place in specific contexts (e.g., during vs after a consultation, during vs at the end of the clerkship) and is provided in different ways (e.g., verbal vs nonverbal). Barriers of effective feedback in community-based settings are: lack of opportunity/initiation, fear of giving feedback, unawareness (of correct feedback and/or lack of prior experience with feedback), and little basis for feedback. Currently, the exchange between the university and community-based learning environments is limited to grading and report writing, with little sharing of meaningful information. The potential of a better exchange between those within community-based learning environments and the university to improve feedback processes is not reached. This exchange and the framework conditions specific for the community-based learning environment should be considered as parts of the structural dimension of feedback. Teachers and course managers of family medicine institutes are in an important position to shape these factors actively, working together with stakeholders of community-based teaching.

TELEDerm: Implementing store-and-forward teledermatology consultations in general practice: Results of a cluster randomized trial.

BACKGROUND: Although teledermatology has been proven internationally to be an effective and safe addition to the care of patients in primary care, there are few pilot projects implementing teledermatology in routine outpatient care in Germany. The aim of this cluster randomized controlled trial was to evaluate whether referrals to dermatologists are reduced by implementing a store-and-forward teleconsultation system in general practitioner practices. METHODS: Eight counties were cluster randomized to the intervention and control conditions. During the 1-year intervention period between July 2018 and June 2019, 46 general practitioner practices in the 4 intervention counties implemented a store-and-forward teledermatology system with Patient Data Management System interoperability. It allowed practice teams to initiate teleconsultations for patients with dermatologic complaints. In the four control counties, treatment as usual was performed. As primary outcome, number of referrals was calculated from routine health care data. Poisson regression was used to compare referral rates between the intervention practices and 342 control practices. RESULTS: The primary analysis revealed no significant difference in referral rates (relative risk = 1.02; 95% confidence interval = 0.911-1.141; p = .74). Secondary analyses accounting for sociodemographic and practice characteristics but omitting county pairing resulted in significant differences of referral rates between intervention practices and control practices. Matched county pair, general practitioner age, patient age, and patient sex distribution in the practices were significantly related to referral rates. CONCLUSIONS: While a store-and-forward teleconsultation system was successfully implemented in the German primary health care setting, the intervention's effect was superimposed by regional factors. Such regional factors should be considered in future teledermatology research.

Intermolecular interaction and cooperativity in an Fe(II) spin crossover molecular thin film system.

Compact domain features have been observed in spin crossover [Fe{H2B(pz)2}2(bipy)] molecular thin film systems via soft x-ray absorption spectroscopy and photoemission electron microscopy. The domains are in a mixed spin state that on average corresponds to roughly 2/3 the high spin occupation of the pure high spin state. Monte Carlo simulations support the presence of intermolecular interactions that can be described in terms of an Ising model in which interactions beyond nearest-neighbors cannot be neglected. This suggests the presence of short-range order to permit interactions between molecules beyond nearest neighbor that contribute to the formation of largely high spin state domains structure. The formation of a spin state domain structure appears to be the result of extensive cooperative effects.

Ethical, Legal, and Social Implications of Symptom Checker Apps in Primary Health Care (CHECK.APP): Protocol for an Interdisciplinary Mixed Methods Study.

BACKGROUND: Symptom checker apps (SCAs) are accessible tools that provide early symptom assessment for users. The ethical, legal, and social implications of SCAs and their impact on the patient-physician relationship, the health care providers, and the health care system have sparsely been examined. This study protocol describes an approach to investigate the possible impacts and implications of SCAs on different levels of health care provision. It considers the perspectives of the users, nonusers, general practitioners (GPs), and health care experts. OBJECTIVE: We aim to assess a comprehensive overview of the use of SCAs and address problematic issues, if any. The primary outcomes of this study are empirically informed multi-perspective recommendations for different stakeholders on the ethical, legal, and social implications of SCAs. METHODS: Quantitative and qualitative methods will be used in several overlapping and interconnected study phases. In study phase 1, a comprehensive literature review will be conducted to assess the ethical, legal, social, and systemic impacts of SCAs. Study phase 2 comprises a survey that will be analyzed with a logistic regression. It aims to assess the user degree of SCAs in Germany as well as the predictors for SCA usage. Study phase 3 will investigate self-observational diaries and user interviews, which will be analyzed as integrated cases to assess user perspectives, usage pattern, and arising problems. Study phase 4 will comprise GP interviews to assess their experiences, perspectives, self-image, and concepts and will be analyzed with the basic procedure by Kruse. Moreover, interviews with health care experts will be conducted in study phase 3 and will be analyzed by using the reflexive thematical analysis approach of Braun and Clark. RESULTS: Study phase 1 will be completed in November 2021. We expect the results of study phase 2 in December 2021 and February 2022. In study phase 3, interviews are currently being conducted. The final study endpoint will be in February 2023. CONCLUSIONS: The possible ethical, legal, social, and systemic impacts of a widespread use of SCAs that affect stakeholders and stakeholder groups on different levels of health care will be identified. The proposed methodological approach provides a multifaceted and diverse empirical basis for a broad discussion on these implications. TRIAL REGISTRATION: German Clinical Trials Register (DRKS) DRKS00022465; https://tinyurl.com/yx53er67. INTERNATIONAL REGISTERED REPORT IDENTIFIER (IRRID): DERR1-10.2196/34026.

A post-Flexner comparative case study of medical training responses to health system needs in Brazil and Germany.

Health systems need medical professionals who can and will work in outpatient settings, such as general practitioner practices or health centres. However, medical students complete only a small portion of their medical training there. Furthermore, this type of training is sometimes seen as inferior to training in academic medical centres and university hospitals. Hence, the healthcare system's demand and the execution of medical curricula do not match. Robust concepts for better alignment of both these parts are lacking. This study aims to (1) describe decentral learning environments in the context of traditional medical curricula and (2) derive ideas for implementing such scenarios further in existing curricula in response to particular medicosocietal needs.This study is designed as qualitative cross-national comparative education research. It comprises three steps: first, two author teams consisting of course managers from Brazil and Germany write a report on change management efforts in their respective faculty. Both teams then compare and comment on the other's report. Emerging similarities and discrepancies are categorised. Third, a cross-national analysis is conducted on the category system.Stakeholders of medical education (medical students, teaching faculty, teachers in decentral learning environments) have differing standards, ideals and goals that are influenced by their own socialisation-prominently, Flexner's view of university hospital training as optimal training. We reiterate that both central and decentral learning environments provide meaningful complementary learning opportunities. Medical students must be prepared to navigate social aspects of learning and accept responsibility for communities. They are uniquely positioned to serve as visionaries and university ambassadors to communities. As such, they can bridge the gap between university hospitals and decentral learning environments.

[Acceptance of Video Consultations in Correctional Facilities from the Patients' Perspective - Results from the Mixed-Methods Evaluation of a Pilot Project in Baden-Württemberg]. / Akzeptanz von Videokonsultationen in Justizvollzugsanstalten aus der Perspektive von Patient/-innen ­ Ergebnisse der gemischt-methodischen Evaluation eines Modellprojekts aus Baden-Württemberg.

OBJECTIVE: Video consultations have proven themselves in international penal systems. Amidst a lack of medical staff, video consultations were offered in five correctional facilities in Baden-Württemberg in 2018 as part of a pilot project. This evaluation study aimed at assessing the acceptance of video consultations among patients. METHODS: The mixed-methods evaluation consisted of site visits, interviews, questionnaires and an analysis of medical treatment data. RESULTS: A total of 305 video consultations were conducted between June and December 2018. Among the most frequent reasons for encounter were feeling anxious/nervous/tense, sleep disturbance, headache and drug abuse. Including familiar medical staff and offering training for the involved physicians were important factors that enabled a trusting communication. CONCLUSION: Video consultations were seen as a useful addition to existing health care. However, they were considered less suitable for both emergencies and physical examinations.

[The Logic Model - a rationale for an encompassing evaluation framework of the German Competence Centers for Postgraduate Medical Education in general practice]. / Das Logische Modell als Grundlage für ein strukturiertes Konzept der Evaluation und Qualitätssicherung der Kompetenzzentren Weiterbildung Allgemeinmedizin.

BACKGROUND: The Competence Centers for Postgraduate Medical Education (KW) established throughout Germany represent complex programs to increase the efficiency and quality of postgraduate medical education in general practice. So-called Logic Models serve as the framework for evaluations and quality management processes of complex programs in many areas. The aim of this article is to develop such a model, using the example of the Competence Center in Baden-Württemberg (KWBW) in order to structure its complex program logic and use it as a framework for future evaluations and quality management processes. METHODS: The adaptation of the Logic Model to the KWBW took place in an informal, nominal group process with employees and participants of the program. RESULTS: We identified 76 core elements of the KWBW. These core elements were classified in one of the five pillars of the Logic Model (input, activity, output, outcome and impact) and categorized according to fields of action and target groups. DISCUSSION: The Logic Model, which was developed using the KWBW as an example, identifies and structures important core elements of a complex postgraduate medical training program for the first time. It seems to be well suited for visualizing the internal logic of this complex program and the interaction of the various elements within the KWBW. It can thus be used as the basis for a comprehensive and systematic evaluation concept and for quality assurance. CONCLUSION: The model is also a prerequisite for comparative research questions of other university programs for postgraduate medical education and thus offers an opportunity for cooperative development efforts. This article therefore contributes to promoting quality in continuing medical training.

Tunable 2D Group-III Metal Alloys.

Chemically stable quantum-confined 2D metals are of interest in next-generation nanoscale quantum devices. Bottom-up design and synthesis of such metals could enable the creation of materials with tailored, on-demand, electronic and optical properties for applications that utilize tunable plasmonic coupling, optical nonlinearity, epsilon-near-zero behavior, or wavelength-specific light trapping. In this work, it is demonstrated that the electronic, superconducting, and optical properties of air-stable 2D metals can be controllably tuned by the formation of alloys. Environmentally robust large-area 2D-Inx Ga1- x alloys are synthesized byConfinement Heteroepitaxy (CHet). Near-complete solid solubility is achieved with no evidence of phase segregation, and the composition is tunable over the full range of x by changing the relative elemental composition of the precursor. The optical and electronic properties directly correlate with alloy composition, wherein the dielectric function, band structure, superconductivity, and charge transfer from the metal to graphene are all controlled by the indium/gallium ratio in the 2D metal layer.

Visualizing electron localization of WS2/WSe2 moiré superlattices in momentum space.

The search for materials with flat electronic bands continues due to their potential to drive strong correlation and symmetry breaking orders. Electronic moirés formed in van der Waals heterostructures have proved to be an ideal platform. However, there is no holistic experimental picture for how superlattices modify electronic structure. By combining spatially resolved angle-resolved photoemission spectroscopy with optical spectroscopy, we report the first direct evidence of how strongly correlated phases evolve from a weakly interacting regime in a transition metal dichalcogenide superlattice. By comparing short and long wave vector moirés, we find that the electronic structure evolves into a highly localized regime with increasingly flat bands and renormalized effective mass. The flattening is accompanied by the opening of a large gap in the spectral function and splitting of the exciton peaks. These results advance our understanding of emerging phases in moiré superlattices and point to the importance of interlayer physics.