Quantum Oscillations in the Field-Induced Ferromagnetic State of MnBi<sub>2-x</sub>Sb<sub>x</sub>Te<sub>4</sub>
ORAL
Abstract
The intrinsic antiferromagnetic (AFM) topological insulator (TI) MnBi2Te4 is expected to possess various exotic quantum states including axion insulator and quantum anomalous Hall effect. When Bi is substituted by Sb, the material crosses a bulk charge neutrality point, from being electron-doped to hole-doped. By applying a magnetic field, it is possible to realize a magnetic Weyl semimetal phase by switching the AFM phase to the FM phase through a meta-magnetic transition at B ~ 6T. Here, we present Shubnikov–de Haas oscillations of MnBi2-xSbxTe4 in a wide range of Sb concentrations close to the charge neutrality point (0.33 ≤ x ≤ 1.21) in the FM state. The evolution of the oscillation frequency and the effective mass shows a good agreement with the Weyl semimetal band-structure of ferromagnetic MnBi2Te4 predicted by density functional calculations. Intriguingly, the quantum oscillation frequency shows a strong temperature dependence, indicating that the electronic structure sensitively depends on magnetism.
*This work is supported as part of Programmable Quantum Materials, an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), under award DE-SC0019443.
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Presenters
Qianni Jiang
University of Washington
Department of Physics, University of Washington
Physics, University of Washington
Authors
Qianni Jiang
University of Washington
Department of Physics, University of Washington
Physics, University of Washington
Chong Wang
Department of Physics, Carnegie Mellon University
Physics, Carnegie Mellon University
Carnegie Mellon University
Carnegie Mellon Univ
Paul Malinowski
University of Washington
Zhaoyu Liu
University of Washington
Yue Shi
University of Washington
Zhong Lin
University of Washington
Zaiyao Fei
Department of Physics, University of Washington
University of Washington
Tiancheng Song
Department of Physics, University of Washington
University of Washington
David E Graf
National High Magnetic Field Laboratory
Florida State University
National High Magnetic Field Lab, Florida State University
National High Magnetic Field Laboratory, Tallahassee and Florida State University
National High Magnetic Field Laboratory, Florida State University
National High Magnetic Field Laboratory (FSU)
Department of Physics, Florida State University
National High Magnetic Field Laboratory and Department of Physics, Florida State University
National High Magnetic Field Lab
National High Magnetic Field Laboratory, Tallahassee, FL
CMS, National High Magnetic Laboratory
Shalinee Chikara
National High Magnetic Field Laboratory
National HIgh Magnetic Field Laboratory
Florida State University
Xiaodong Xu
Physics, University of Washington
Department of Physics, University of Washington
University of Washington
Department of Physics, University of Washington, Seattle
University of Washington, Seattle
Jiaqiang Yan
Materials Science and Technology Division, Oak Ridge National Lab
Oak Ridge National Laboratory
University of Tennessee
Oak Ridge National Lab
Materials Science and Technology Division, Oak Ridge National Laboratory
Materials Science and Technology, Oak Ridge National Laboratory
Oak Ridge National Laboratory, Materials Science and Technology Division
Di Xiao
Carnegie Mellon Univ
Carnegie Mellon University
Department of Physics, Carnegie Mellon University
Physics, Carnegie Mellon University
Jiun-Haw Chu
University of Washington
Department of Physics, University of Washington, Seattle
