High-Chern-number and high-temperature quantum Hall effect without Landau levels.

ABSTRACT: The quantum Hall effect (QHE) with quantized Hall resistance of h/νe ² started the research on topological quantum states and laid the foundation of topology in physics. Since then, Haldane proposed the QHE without Landau levels, showing nonzero Chern number |C| = 1, which has been experimentally observed at relatively low temperatures. For emerging physics and low-power-consumption electronics, the key issues are how to increase the working temperature and realize high Chern numbers (C > 1). Here, we report the experimental discovery of high-Chern-number QHE (C = 2) without Landau levels and C = 1 Chern insulator state displaying a nearly quantized Hall resistance plateau above the Néel temperature in MnBi₂Te₄ devi

SUBMITTER: Ge J 

PROVIDER: S-EPMC8289033 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature