Valley Hall Effect in Two-Dimensional Hexagonal Lattices
Valley Hall Effect in Two-Dimensional Hexagonal Lattices
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DOI：
10.7566/jpsj.84.121006
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发表时间：
2015-11
影响因子：
1.7
通讯作者：
M. Yamamoto;Y. Shimazaki;I. Borzenets;S. Tarucha
中科院分区：
文献类型：
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作者：
M. Yamamoto;Y. Shimazaki;I. Borzenets;S. Tarucha
谷是定义为晶体材料的能带中能量简并但不等效的结构的量子数。最近发现的二维（2D）层状材料揭示了这种自由度的信息载体的潜在用途，因为现在可以在集成的2D架构中潜在地操纵谷。在动量空间中相隔很长距离的谷对外部干扰是鲁棒的，谷的流动，谷电流，是非耗散的，因为它不携带净电子电流。在各种2D谷材料中，石墨烯具有迄今为止最高的晶体质量，导致体中极其长的谷长谷弛豫长度。在这篇综述中，我们首先描述了谷霍尔效应的理论背景，它将电场转换为谷电流。然后，我们描述了第一次观察到的山谷霍尔效应在单层二硫化钼。最后，我们描述了实验的生成和…
Valley is a quantum number defined for energetically degenerate but nonequivalent structures in energy bands of a crystalline material. Recent discoveries of two-dimensional (2D) layered materials have shed light on the potential use of this degree of freedom for information carriers because the valley can now be potentially manipulated in integrated 2D architectures. The valleys separated by a long distance in a momentum space are robust against external disturbance and the flow of the valley, the valley current, is nondissipative because it carries no net electronic current. Among the various 2D valley materials, graphene has by far the highest crystal quality, leading to an extremely long valley relaxation length in the bulk. In this review, we first describe the theoretical background of the valley Hall effect, which converts an electric field into a valley current. We then describe the first observation of the valley Hall effect in monolayer MoS2. Finally, we describe experiments on the generation an...