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Large Exchange Coupling Between Localized Spins and Topological Bands in MnBi2 Te4.
Padmanabhan, Hari; Stoica, Vladimir A; Kim, Peter K; Poore, Maxwell; Yang, Tiannan; Shen, Xiaozhe; Reid, Alexander H; Lin, Ming-Fu; Park, Suji; Yang, Jie; Wang, Huaiyu Hugo; Koocher, Nathan Z; Puggioni, Danilo; Georgescu, Alexandru B; Min, Lujin; Lee, Seng Huat; Mao, Zhiqiang; Rondinelli, James M; Lindenberg, Aaron M; Chen, Long-Qing; Wang, Xijie; Averitt, Richard D; Freeland, John W; Gopalan, Venkatraman.
Afiliación
  • Padmanabhan H; Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, 16802, USA.
  • Stoica VA; Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, 16802, USA.
  • Kim PK; Department of Physics, University of California San Diego, La Jolla, CA, 92093, USA.
  • Poore M; Department of Physics, University of California San Diego, La Jolla, CA, 92093, USA.
  • Yang T; Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, 16802, USA.
  • Shen X; SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA.
  • Reid AH; SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA.
  • Lin MF; SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA.
  • Park S; SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA.
  • Yang J; SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA.
  • Wang HH; Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, 16802, USA.
  • Koocher NZ; Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA.
  • Puggioni D; Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA.
  • Georgescu AB; Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA.
  • Min L; Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, 16802, USA.
  • Lee SH; 2D Crystal Consortium, Materials Research Institute, The Pennsylvania State University, University Park, PA, 16802, USA.
  • Mao Z; Department of Physics, Penn State University, University Park, PA, 16802, USA.
  • Rondinelli JM; 2D Crystal Consortium, Materials Research Institute, The Pennsylvania State University, University Park, PA, 16802, USA.
  • Lindenberg AM; Department of Physics, Penn State University, University Park, PA, 16802, USA.
  • Chen LQ; Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA.
  • Wang X; SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA.
  • Averitt RD; Department of Materials Science and Engineering, Stanford University, Menlo Park, CA, 94305, USA.
  • Freeland JW; Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, 16802, USA.
  • Gopalan V; SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA.
Adv Mater ; 34(49): e2202841, 2022 Dec.
Article en En | MEDLINE | ID: mdl-36189841
ABSTRACT
Magnetism in topological materials creates phases exhibiting quantized transport phenomena with potential technological applications. The emergence of such phases relies on strong interaction between localized spins and the topological bands, and the consequent formation of an exchange gap. However, this remains experimentally unquantified in intrinsic magnetic topological materials. Here, this interaction is quantified in MnBi2 Te4 , a topological insulator with intrinsic antiferromagnetism. This is achieved by optically exciting Bi-Te p states comprising the bulk topological bands and interrogating the consequent Mn 3d spin dynamics, using a multimodal ultrafast approach. Ultrafast electron scattering and magneto-optic measurements show that the p states demagnetize via electron-phonon scattering at picosecond timescales. Despite being energetically decoupled from the optical excitation, the Mn 3d spins, probed by resonant X-ray scattering, are observed to disorder concurrently with the p spins. Together with atomistic simulations, this reveals that the exchange coupling between localized spins and the topological bands is at least 100 times larger than the superexchange interaction, implying an optimal exchange gap of at least 25 meV in the surface states. By quantifying this exchange coupling, this study validates the materials-by-design strategy of utilizing localized magnetic order to manipulate topological phases, spanning static to ultrafast timescales.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Adv Mater Asunto de la revista: BIOFISICA / QUIMICA Año: 2022 Tipo del documento: Article País de afiliación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Adv Mater Asunto de la revista: BIOFISICA / QUIMICA Año: 2022 Tipo del documento: Article País de afiliación: Estados Unidos