Quantum spin Hall state at Room temperature
POSTER
Abstract
Search for macroscopic quantum phenomena at room temperature is a major pursuit in physics. There has been only a single definitive report of such a phenomenon, namely the room-temperature integer quantum Hall effect at ultra-high magnetic fields [1]. In this poster, I will present our discovery of a zero-magnetic field, room-temperature quantum phenomena- quantum spin Hall state featuring a bulk energy gap and a gapless, in-gap edge state protected by the time-reversal symmetry [2]. Our material platform is Bi4Br4, which has a large energy gap, facilitating the high-temperature robustness of the quantum spin Hall state.
[1] Science 315, 1379 (2007).
[2] Nature Materials 21, 1111 (2022).
[1] Science 315, 1379 (2007).
[2] Nature Materials 21, 1111 (2022).
*Experimental and theoretical work at Princeton University was supported by the Gordon and Betty Moore Foundation (GBMF4547 and GBMF9461)
Publication: N. Shumiya*, Md S. Hossain*, J.-X. Yin*, Z. Wang*, M. Litskevich*, C. Yoon*, Y. Li, Y. Yang, Y.-X. Jiang, G. Cheng, Y.-C. Lin, Q. Zhang, Z.-J. Cheng, T. A. Cochran, D. Multer, X. P Yang, B. Casas, T.-R. Chang, T. Neupert, Z. Yuan, S. Jia, H. Lin, N. Yao, L. Balicas, F. Zhang, Y. Yao, and M. Z. Hasan, Evidence of a room-temperature quantum spin Hall edge state in a higher-order topological insulator, Nature Materials 21, 1111 (2022).
Presenters
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Shafayat Hossain
- Princeton University