An out-of-plane electric field breaks PT symmetry in even-layer MnBi2Te4 and drives a topological phase transition to a Chern insulator with Chern number 3, enabling an electric-field-controlled anomalous Hall switch.
High-Chern-Number and High-Temperature Quantum Hall Effect without Landau Levels
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abstract
The quantum Hall effect (QHE) with quantized Hall resistance of h/{\nu}e2 starts the research on topological quantum states and lays the foundation of topology in physics. Afterwards, 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 nearly quantized Hall resistance plateau above the N\'eel temperature in MnBi2Te4 devices. Our observations provide a new perspective on topological matter and open new avenues for exploration of exotic topological quantum states and topological phase transitions at higher temperatures.
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cond-mat.mtrl-sci 1years
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Berry Curvature Engineering by Gating Two-Dimensional Antiferromagnets
An out-of-plane electric field breaks PT symmetry in even-layer MnBi2Te4 and drives a topological phase transition to a Chern insulator with Chern number 3, enabling an electric-field-controlled anomalous Hall switch.