Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session F45: Fractionalized Excitations, Nonlinearities and Phonons in Kitaev systems
8:00 AM–11:00 AM,
Tuesday, March 15, 2022
Room: McCormick Place W-375D
Sponsoring Units: DCMP GMAG DMP
Chair: Natalia Perkins, University of Minnesota
Abstract: F45.00005 : Quantized thermal Hall effect and topological phase transition in the Kitaev spin liquid candidate α-RuCl3*
10:24 AM–11:00 AM
An important question is the fate of topologically nontrivial state at intense fields. At high magnetic fields, the half-integer quantization disappears and the thermal Hall conductance κxy goes to zero rapidly, indicating a possible topological phase transition from the Kitaev QSL to a state without chiral Majorana edge modes. We find that the heat capacity exhibits a distinct anomaly at μ0H* ~ 11 T. Interestingly, H* is closed to the field where κxy vanishes. Along with the fact that the longitudinal thermal conductivity shows a discontinuous jump at H ~ H* , our results provide thermodynamic evidence for a first-order topological phase transition in the spin liquid state of α-RuCl3.
This work is in collaboration with T. Onishi, S. Ma, T. Yokoi, Y. Matsuda (Kyoto Univ.), S. Kasahara (Okayama Univ.), Y. Mizukami, O. Tanaka, T. Shibauchi, Y. Motome (Univ. of Tokyo), N. Kurita, H. Tanaka (Tokyo Institute of Technology), C. Hickey, S. Trebst (Univ. of Cologne).
*This work was supported by Grants-in-Aid for Scientific Research (KAKENHI) from JSPS and JST-CREST (JP-MJCR19T5).
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