Lifshitz transitions in Kondo Insulator YbB<sub>12</sub>
ORAL
Abstract
The Landau Level quantizations were observed in both magnetization and electrical resistivity in Kondo insulator YbB12 [1,2]. At the intense magnetic fields, the quantum oscillation patterns resemble that contributions from the crystal bulk [3]. In contrast, at zero-field, the electrical conductance of the micron-size YbB12 is shown to be independent of the sample thickness and thus indicating the origin of the surfaces [4]. To solve this problem, we carried out the Hall effect and Seebeck effect measurements in YbB12 under intense magnetic fields. Our results suggest the magnetic field drives Lifshitz transitions, which lead to the changes in electronic structures at the intense magnetic fields.
*The work at Michigan is supported by the National Science Foundation under Award No. DMR-1707620 and No. DMR-2004288 (trans- port measurements), by the Department of Energy under Award No. DE-SC0020184 (magnetization measurements), by the Office of Naval Research through DURIP Award No. N00014-17-1-2357 (instrumentation).
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Publication: 1. Z. Xiang, et al., Quantum oscillations of electrical resistivity in an insulator, Science 69, 65 (2018).
2. Y. Sato, et al., Unconventional thermal metallic state of charge-neutral fermions in an insulator, Nature Physics 15, 954 (2019).
3. Z. Xiang, et al., Unusual high-field metal in a Kondo insulator, Nature Physics 17, 788 (2021).
4. Y. Sato, et al., Topological surface conduction in Kondo insulator YbB12}, J. Phys. D: Appl. Phys. 54, 404002 (2021).
Presenters
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Lu Li
- University of Michigan