Photoinduced anisotropic edge states and signatures of nonequilibrium spin polarization in silicene nanoribbons

Wang，Jia kun1; Li，Jia Yu1,2; Duan，Hou Jian1; Wang，Rui Qiang1

2020

10.1016/j.physleta.2020.126429

PHYSICS LETTERS A   影响因子和分区

0375-9601

1873-2429

Most topological phase transitions are accompanied by the emergence of surface/edge states with spin dependence. Usually, the quantized Hall conductivity cannot characterize the anisotropic transports and spin dependence of topological states. Here, we study the intricate topological phase transition and the anisotropic behavior of edge states in silicene nanoribbon submitted to an electric field or/and a light irradiation. It is interesting to find that a circularly polarized light can induce a type-II quantum anomaly Hall phase, which is manifested as the high Chern number and the strong anisotropic edge states. Besides the measurement of the quantized Hall conductivity, we further propose to probe these topological phase transitions and the anisotropy of edge states by measuring the current-induced nonequilibrium spin polarization. It is found that the spin polarization exhibits more signatures about the behavior of surface/edge states, beyond the quantized Hall conductivity, especially for spin-dependent transports with different velocities.

Off-resonant light Silicene Spin polarization Topological phase

SCI ; EI

英语

其他

National Natural Science Foundation of China[11874016] ; Key Program for Guangdong NSF of China[2017B030311003]

Physics

Physics, Multidisciplinary

WOS:000537033500002

ELSEVIER

20201508394976

Electric fields ; Topology ; Nanoribbons ; Quantum theory ; Spin polarization ; Anisotropy

Electricity: Basic Concepts and Phenomena:701.1 ; Nanotechnology:761 ; Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Quantum Theory; Quantum Mechanics:931.4 ; High Energy Physics:932.1

PHYSICS

2-s2.0-85082836481

Scopus

1.Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials,School of Physics and Telecommunication Engineering,South China Normal University,Guangzhou,510006,China
2.Shenzhen Institute for Quantum Science and Technology,Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China

Wang，Jia kun,Li，Jia Yu,Duan，Hou Jian,et al. Photoinduced anisotropic edge states and signatures of nonequilibrium spin polarization in silicene nanoribbons[J]. PHYSICS LETTERS A,2020,384(22).

Wang，Jia kun,Li，Jia Yu,Duan，Hou Jian,&Wang，Rui Qiang.(2020).Photoinduced anisotropic edge states and signatures of nonequilibrium spin polarization in silicene nanoribbons.PHYSICS LETTERS A,384(22).

Wang，Jia kun,et al."Photoinduced anisotropic edge states and signatures of nonequilibrium spin polarization in silicene nanoribbons".PHYSICS LETTERS A 384.22(2020).