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Giant chiral magnetoelectric oscillations in a van der Waals multiferroic.
Gao, Frank Y; Peng, Xinyue; Cheng, Xinle; Viñas Boström, Emil; Kim, Dong Seob; Jain, Ravish K; Vishnu, Deepak; Raju, Kalaivanan; Sankar, Raman; Lee, Shang-Fan; Sentef, Michael A; Kurumaji, Takashi; Li, Xiaoqin; Tang, Peizhe; Rubio, Angel; Baldini, Edoardo.
Afiliación
  • Gao FY; Department of Physics and Center for Complex Quantum Systems, The University of Texas at Austin, Austin, TX, USA.
  • Peng X; Department of Physics and Center for Complex Quantum Systems, The University of Texas at Austin, Austin, TX, USA.
  • Cheng X; Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany.
  • Viñas Boström E; Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany.
  • Kim DS; Nano-Bio Spectroscopy Group, Departamento de Física de Materiales, Universidad del País Vasco, San Sebastián, Spain.
  • Jain RK; Department of Physics and Center for Complex Quantum Systems, The University of Texas at Austin, Austin, TX, USA.
  • Vishnu D; Institute of Physics, Academia Sinica, Taipei, Taiwan.
  • Raju K; Institute of Physics, Academia Sinica, Taipei, Taiwan.
  • Sankar R; Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan.
  • Lee SF; Institute of Physics, Academia Sinica, Taipei, Taiwan.
  • Sentef MA; Institute of Physics, Academia Sinica, Taipei, Taiwan.
  • Kurumaji T; Institute of Physics, Academia Sinica, Taipei, Taiwan.
  • Li X; Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany.
  • Tang P; Institute for Theoretical Physics and Bremen Center for Computational Materials Science, University of Bremen, Bremen, Germany.
  • Rubio A; Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, CA, USA.
  • Baldini E; Department of Physics and Center for Complex Quantum Systems, The University of Texas at Austin, Austin, TX, USA.
Nature ; 632(8024): 273-279, 2024 Aug.
Article en En | MEDLINE | ID: mdl-39020169
ABSTRACT
Helical spin structures are expressions of magnetically induced chirality, entangling the dipolar and magnetic orders in materials1-4. The recent discovery of helical van der Waals multiferroics down to the ultrathin limit raises prospects of large chiral magnetoelectric correlations in two dimensions5,6. However, the exact nature and magnitude of these couplings have remained unknown so far. Here we perform a precision measurement of the dynamical magnetoelectric coupling for an enantiopure domain in an exfoliated van der Waals multiferroic. We evaluate this interaction in resonance with a collective electromagnon mode, capturing the impact of its oscillations on the dipolar and magnetic orders of the material with a suite of ultrafast optical probes. Our data show a giant natural optical activity at terahertz frequencies, characterized by quadrature modulations between the electric polarization and magnetization components. First-principles calculations further show that these chiral couplings originate from the synergy between the non-collinear spin texture and relativistic spin-orbit interactions, resulting in substantial enhancements over lattice-mediated effects. Our findings highlight the potential for intertwined orders to enable unique functionalities in the two-dimensional limit and pave the way for the development of van der Waals magnetoelectric devices operating at terahertz speeds.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nature Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nature Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido