Your browser doesn't support javascript.
loading
Observation of room-temperature polar skyrmions.
Das, S; Tang, Y L; Hong, Z; Gonçalves, M A P; McCarter, M R; Klewe, C; Nguyen, K X; Gómez-Ortiz, F; Shafer, P; Arenholz, E; Stoica, V A; Hsu, S-L; Wang, B; Ophus, C; Liu, J F; Nelson, C T; Saremi, S; Prasad, B; Mei, A B; Schlom, D G; Íñiguez, J; García-Fernández, P; Muller, D A; Chen, L Q; Junquera, J; Martin, L W; Ramesh, R.
  • Das S; Department of Materials Science and Engineering, University of California, Berkeley, CA, USA. sujitdas@berkeley.edu.
  • Tang YL; Department of Materials Science and Engineering, University of California, Berkeley, CA, USA.
  • Hong Z; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.
  • Gonçalves MAP; Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, USA.
  • McCarter MR; Materials Research and Technology Department, Luxembourg Institute of Science and Technology (LIST), Esch/Alzette, Luxembourg.
  • Klewe C; Department of Physics, University of California, Berkeley, CA, USA.
  • Nguyen KX; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.
  • Gómez-Ortiz F; Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, USA.
  • Shafer P; Departamento de Ciencias de la Tierra y Física de la Materia Condensada, Universidad de Cantabria, Santander, Spain.
  • Arenholz E; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.
  • Stoica VA; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.
  • Hsu SL; Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA, USA.
  • Wang B; Department of Materials Science and Engineering, University of California, Berkeley, CA, USA.
  • Ophus C; National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.
  • Liu JF; Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, USA.
  • Nelson CT; National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.
  • Saremi S; Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.
  • Prasad B; Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, USA.
  • Mei AB; Department of Materials Science and Engineering, University of California, Berkeley, CA, USA.
  • Schlom DG; Department of Materials Science and Engineering, University of California, Berkeley, CA, USA.
  • Íñiguez J; Department of Materials Science and Engineering, Cornell University, Ithaca, NY, USA.
  • García-Fernández P; Department of Materials Science and Engineering, Cornell University, Ithaca, NY, USA.
  • Muller DA; Kavli Institute at Cornell for Nanoscale Science, Ithaca, NY, USA.
  • Chen LQ; Materials Research and Technology Department, Luxembourg Institute of Science and Technology (LIST), Esch/Alzette, Luxembourg.
  • Junquera J; Physics and Material Science Research Unit, University of Luxembourg, Belvaux, Luxembourg.
  • Martin LW; Departamento de Ciencias de la Tierra y Física de la Materia Condensada, Universidad de Cantabria, Santander, Spain.
  • Ramesh R; Kavli Institute at Cornell for Nanoscale Science, Ithaca, NY, USA.
Nature ; 568(7752): 368-372, 2019 04.
Article en En | MEDLINE | ID: mdl-30996320
ABSTRACT
Complex topological configurations are fertile ground for exploring emergent phenomena and exotic phases in condensed-matter physics. For example, the recent discovery of polarization vortices and their associated complex-phase coexistence and response under applied electric fields in superlattices of (PbTiO3)n/(SrTiO3)n suggests the presence of a complex, multi-dimensional system capable of interesting physical responses, such as chirality, negative capacitance and large piezo-electric responses1-3. Here, by varying epitaxial constraints, we discover room-temperature polar-skyrmion bubbles in a lead titanate layer confined by strontium titanate layers, which are imaged by atomic-resolution scanning transmission electron microscopy. Phase-field modelling and second-principles calculations reveal that the polar-skyrmion bubbles have a skyrmion number of +1, and resonant soft-X-ray diffraction experiments show circular dichroism, confirming chirality. Such nanometre-scale polar-skyrmion bubbles are the electric analogues of magnetic skyrmions, and could contribute to the advancement of ferroelectrics towards functionalities incorporating emergent chirality and electrically controllable negative capacitance.
Texto completo
Imprimir
XML
PubMed Links
Search on Google

Texto completo: 1 Banco de datos: MEDLINE Idioma: En Año: 2019 Tipo del documento: Article
Texto completo
Imprimir
XML
PubMed Links
Search on Google

Texto completo: 1 Banco de datos: MEDLINE Idioma: En Año: 2019 Tipo del documento: Article