Landau quantisation of photonic spin Hall effect in monolayer black phosphorus

Nanophotonics

article

Guangyi Jia¹  Geng Li²  Yan Zhou¹  Xianglong Miao²  Xiaoying Zhou³ 

[1] School of Science, Tianjin University of Commerce;Department of Electrical Engineering, The State University of New York at Buffalo;Department of Physics and Key Laboratory for Low-Dimensional Structures and Quantum Manipulation (Ministry of Education), Hunan Normal University

关键词: photonic spin Hall effect;    Landau quantisation;    magneto-optical response;    black phosphorus;   

DOI  :  10.1515/nanoph-2019-0424

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

The photonic spin Hall effect (PSHE) is a promising candidate for controlling the spin states of photons and exploiting next-generation photonic devices based on spinoptics. Herein, the influences of a perpendicular magnetic field on the PSHE appearing on the surface of monolayer black phosphorus (BP) are investigated. Results reveal that both the in-plane and transverse spin-dependent shifts are quantised and show an oscillating pattern due to the splitting of Landau levels (LLs) induced by the external magnetic field B . And the oscillation period of spin Hall shifts gradually increases with strengthening B because of the increase of LL spacings. By contrast, for a fixed magnetic field, as the LL spacings become smaller and smaller with increasing the LL index, the oscillation period of spin Hall shifts gradually decreases as the photonic energy increases. Moreover, it is possibly due to the synergistic role of intrinsic anisotropy, high crystallinity, and quantisation-incurred localised decreases in beating-like complex conductivities of the BP film, giant spin Hall shifts, hundreds of times of the incident wavelength, are obtained in both transverse and in-plane directions. These unambiguously confirm the strong impact of the external magnetic field on the PSHE and shed important insights into understanding the rich magneto-optical transport properties in anisotropic two-dimensional atomic crystals.

【 授权许可】

CC BY