Unveiling the chirality of the quantum anomalous Hall effect

Chen, Hongyu; Jin, Yuanjun; Yahyavi, Mohammad; Belopolski, Ilya1; Shao, Sen; Hou, Tao; Wang, Naizhou; Hsu, Chia-Hsiu; Zhao, Yilin; Yang, Bo; Ma, Qiong2,3; Yin, Jia-Xin3,4; Xu, Su-Yang5; Gao, Wei-bo1; Chang, Guoqing1

2024-03-12

10.1103/PhysRevB.109.125305

PHYSICAL REVIEW B   影响因子和分区

2469-9950

2469-9969

The ordinary and quantum Hall effects with fixed carrier types, electron or hole, exhibit well-defined chirality under external magnetic fields, but the analogous chirality of the quantum anomalous Hall effect (QAHE) remains little explored. Here, for the electronic structures of intrinsic QAHE systems, we show that the local Berry curvature is linked with the angular-momentum difference l delta z of the inverted bands. In the presence of rotation symmetries, the value of l delta z will be quantized and set as the Chern number. The quantized l delta z will also give rise to a unique quantized magnetic circular dichroism effect in the case of resonance absorption. By l delta z, we find that the chiral flow-direction of an electron in the QAHE is not explicitly related to the intrinsic spin axis, thereby enabling the spin-momentum-unlocking edge states in an antiferromagnetic QAHE system. The validity of our theory is confirmed through rigorous examinations using perturbation theory, k p modeling, tight-binding modeling, and first-principle calculations, which predicts exotic behavior in experimentally accessible quantum materials.

SCI ; EI

英语

其他

National Research Foundation (NRF), Singapore, under its Fellowship Award[NRF-NRFF13-2021-0010] ; NRF, Singapore, under the NRF fellowship award[NRF-NRFF12-2020-005] ; Center for the Advancement of Topological Semimetals, an Energy Frontier Research Center - U.S. Department of Energy Office of Science, through the Ames Laboratory[DEAC02-07CH11358] ; National Key R&D Program of China[2023YFA1407300] ; National Science Foundation of China[12374060] ; National Research Foundation (NRF), Singapore through its Competitive Research Program[NRF-CRP22-2019-0004]

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:001229514000001

AMER PHYSICAL SOC

PHYSICS

Web of Science

1.Nanyang Technol Univ, Div Phys & Appl Phys, Sch Phys & Math Sci, Singapore 637371, Singapore
2.RIKEN, Ctr Emergent Matter Sci CEMS, Wako, Saitama 3510198, Japan
3.Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA
4.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China
5.Harvard Univ, Dept Chem & Chem Biol, Cambridge, MA USA

Chen, Hongyu,Jin, Yuanjun,Yahyavi, Mohammad,et al. Unveiling the chirality of the quantum anomalous Hall effect[J]. PHYSICAL REVIEW B,2024,109(12).

Chen, Hongyu.,Jin, Yuanjun.,Yahyavi, Mohammad.,Belopolski, Ilya.,Shao, Sen.,...&Chang, Guoqing.(2024).Unveiling the chirality of the quantum anomalous Hall effect.PHYSICAL REVIEW B,109(12).

Chen, Hongyu,et al."Unveiling the chirality of the quantum anomalous Hall effect".PHYSICAL REVIEW B 109.12(2024).