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MBE Synthesis and Characterization of Intrinsic Magnetic Topological Insulator MnBi<sub>2</sub>Se<sub>4</sub>

ORAL

Abstract

Intrinsic magnetic topological insulators are stoichiometric materials with both magnetic ordering and topological electronic states. Due to its inherent magnetism, this class of materials processes rich topological quantum phases that induced by symmetry breaking, while maintaining good crystallinity and high purity of the material. We report the MBE synthesis and characterization of an intrinsic magnetic topological insulator MnBi2Se4. The MnBi2Se4 thin films are deposited with alternating layer growth of Bi2Se3 and a-MnSe(111). The high quality of the material is shown with cross-sectional TEM. Dirac surface state is demonstrated with angle-resolved photoemission spectroscopy above its magnetic ordering temperature. SQUID magnetometry measurement on films with different thicknesses shows layered-antiferromagnetic ordering in this material. Low-field SQUID measurement also shows a hysteresis loop, with magnetic moments preferred to stay within the lattice plane. The ferromagnetic signal is attributed to uncompensated magnetic moments at the surface. Its magnetic characterization is also confirmed with XMCD measurement. Furthermore, magnetometry measurement also shows that the magnetic ordering in MnBi2Se4 persists down to the monolayer limit.

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Presenters

  • Tiancong Zhu

    University of California, Berkeley, Department of Physics, University of California, Berkeley, Ohio State Univ - Columbus

Authors

  • Tiancong Zhu

    University of California, Berkeley, Department of Physics, University of California, Berkeley, Ohio State Univ - Columbus

  • Alexander Bishop

    Ohio State Univ - Columbus, Department of Physics, The Ohio State University

  • Tong Zhou

    Department of Physics, State Univ of NY - Buffalo, Department of Physics, State University at New York at Buffalo, Physics, University at Buffalo, State University of New York, State Univ of NY - Buffalo

  • Dante J O'Hara

    Materials Science Division, Lawrence Livermore National Laboratory, Ohio State Univ - Columbus

  • Menglin Zhu

    Ohio State Univ - Columbus, Center for Electron Microscopy and Analysis, The Ohio State University

  • Robert Walko

    Ohio State Univ - Columbus, Department of Physics, The Ohio State University

  • Brenton Noesges

    Department of Physics, The Ohio State University

  • Shuyu Cheng

    Department of Physics, The Ohio State University

  • Jacob Repicky

    Ohio State Univ - Columbus, Department of Physics, The Ohio State University

  • Alexander Baker

    Materials Science Division, Lawrence Livermore National Laboratory

  • tao Liu

    Ohio State Univ - Columbus, Department of Physics, The Ohio State University

  • John William Freeland

    Advanced Photon Source, Argonne National Lab, Argonne National Lab, Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA, Argonne National Laboratory, Advanced Photon Source, Argonne National Laboratory

  • Mark Brenner

    Department of Electrical & Computer Engineering, The Ohio State University

  • Chris Jozwiak

    Advanced Light Source, Lawrence Berkeley National Lab, Lawrence Berkeley National Laboratory, Advanced Light Source, Lawrence Berkeley National Laboratory, Advanced Light Source, E. O. Lawrence Berkeley National Laboratory, ALS, Lawrence Berkeley National Lab, Advanced Light Source

  • Eli Rotenberg

    Advanced Light Source, Lawrence Berkeley National Laboratory, Lawrence Berkeley National Laboratory, Advanced Light Source, Lawrence Berkeley National Lab, Advanced Light Source, E. O. Lawrence Berkeley National Laboratory, ALS, Lawrence Berkeley National Lab, Advanced Light Source

  • Leonard J Brillson

    Department of Physics, The Ohio State University

  • Jinwoo Hwang

    Ohio State Univ - Columbus, Center for Electron Microscopy and Analysis, The Ohio State University, The Ohio State University

  • Igor Zutic

    Department of Physics, State Univ of NY - Buffalo, University at Buffalo, Physics, Buffalo State Univeristy of New York, Department of Physics, State University at New York at Buffalo, State Univ of NY - Buffalo, Physics, University at Buffalo, State University of New York, Department of Physics, University at Buffalo, Department of physics, University at Buffalo

  • Jay A Gupta

    Ohio State Univ - Columbus, Department of Physics, The Ohio State University

  • Roland Kawakami

    Ohio State Univ - Columbus, Department of Physics, The Ohio State University, Physics, Ohio State University