Gate Switchable Transport and Optical Anisotropy in 90° Twisted Bilayer Black Phosphorus

被引:84
作者
Cao, Ting [1 ,2 ]
Li, Zhenglu [1 ,2 ]
Qiu, Diana Y. [1 ,2 ]
Louie, Steven G. [1 ,2 ]
机构
[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
[2] Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA
基金
美国国家科学基金会;
关键词
2D materials; black phosphorus; gate switchable anisotropy; electron transport; optical dichroism; MOLYBDENUM-DISULFIDE; QUASI-PARTICLE; OPTOELECTRONICS; EXCITONS; SPIN;
D O I
10.1021/acs.nanolett.6b02084
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Anisotropy describes the directional dependence of a material's properties such as transport and optical response. In conventional bulk materials, anisotropy is intrinsically related to the crystal structure and thus not tunable by the gating techniques used in modern electronics. Here we show that, in bilayer black phosphorus with an interlayer twist angle of 90 degrees, the anisotropy of its electronic structure and optical transitions is tunable by gating. Using first-principles calculations, we predict that a laboratory-accessible gate voltage can induce a hole effective mass that is 30 times larger along one Cartesian axis than along the other axis, and the two axes can be exchanged by flipping the sign of the gate voltage. This gate-controllable band structure also leads to a switchable optical linear dichroism, where the polarization of the lowest-energy optical transitions (absorption or luminescence) is tunable by gating. Thus, anisotropy is a tunable degree of freedom in twisted bilayer black phosphorus.
引用
收藏
页码:5542 / 5546
页数:5
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