Tanaka Miuko, Shimazaki Yuya, Borzenets Ivan Valerievich, Watanabe Kenji, Taniguchi Takashi, Tarucha Seigo, Yamamoto Michihisa
Department of Applied Physics, University of Tokyo, Tokyo, 113-8656, Japan.
Institute of Quantum Electronics, ETH Zurich, CH-8093, Zurich, Switzerland.
Phys Rev Lett. 2021 Jan 8;126(1):016801. doi: 10.1103/PhysRevLett.126.016801.
The intrinsic Hall effect allows for the generation of a nondissipative charge neutral current, such as a pure spin current generated via the spin Hall effect. Breaking of the spatial inversion or time reversal symmetries, or the spin-orbit interaction is generally considered necessary for the generation of such a charge neutral current. Here, we challenge this general concept and present generation and detection of a charge neutral current in a centrosymmetric material with little spin-orbit interaction. We employ bilayer graphene, and find enhanced nonlocal transport in the quantum Hall antiferromagnetic state, where spontaneous symmetry breaking occurs due to the electronic correlation.
本征霍尔效应能够产生无耗散的电荷中性电流，比如通过自旋霍尔效应产生的纯自旋电流。通常认为，空间反演或时间反演对称性的破缺，或者自旋-轨道相互作用，是产生这种电荷中性电流所必需的。在此，我们对这一普遍概念提出质疑，并展示了在具有微弱自旋-轨道相互作用的中心对称材料中电荷中性电流的产生与检测。我们使用双层石墨烯，并在量子霍尔反铁磁态中发现了增强的非局域输运，在该状态下，由于电子关联会发生自发对称性破缺。
