Rashba-splitting-induced topological flat band detected by anomalous resistance oscillations beyond the quantum limit in ZrTe5

Dong Xing, Bingbing Tong, Senyang Pan, Zezhi Wang, Jianlin Luo, Jinglei Zhang and Cheng-Long Zhang ()
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Dong Xing: Chinese Academy of Sciences
Bingbing Tong: Chinese Academy of Sciences
Senyang Pan: Chinese Academy of Sciences
Zezhi Wang: Chinese Academy of Sciences
Jianlin Luo: Chinese Academy of Sciences
Jinglei Zhang: Chinese Academy of Sciences
Cheng-Long Zhang: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract Topological flat bands — where the kinetic energy of electrons is quenched — provide a platform for investigating the topological properties of correlated systems. Here, we report the observation of a topological flat band formed by polar-distortion-assisted Rashba splitting in the three-dimensional Dirac material ZrTe5. The polar distortion and resulting Rashba splitting on the band are directly detected by torque magnetometry and the anomalous Hall effect, respectively. The local symmetry breaking further flattens the band, on which we observe resistance oscillations beyond the quantum limit. These oscillations follow the temperature dependence of the Lifshitz–Kosevich formula but are evenly distributed in B instead of 1/B at high magnetic fields. Furthermore, the cyclotron mass gets anomalously enhanced about 102 times at fields ~ 20 T. Our results provide an intrinsic platform without invoking moiré or order-stacking engineering, which opens the door for studying topologically correlated phenomena beyond two dimensions.

Date: 2024
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DOI: 10.1038/s41467-024-48761-9

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