交换场和非共振光对单层MoS2能带结构的调控

doi:10.3969/j.cnki.jdxb.2018.03.008

吉首大学学报（自然科学版）

交换场和非共振光对单层MoS₂能带结构的调控

张新成，廖文虎

(吉首大学物理与机电工程学院，湖南吉首 416000)

出版日期:2018-05-25 发布日期:2018-06-27
通讯作者: 廖文虎(1978—)，男，湖北宜昌人，吉首大学物理与机电工程学院副教授，博士，主要从事介观纳米体系量子输运及其调控研究.
基金资助:
国家自然科学基金资助项目(11664010)；湖南省自然科学基金资助项目(2017JJ2217）；湖南省自然科学基金资助青年项目（12JJ4003）；吉首大学校级科研项目(JDY16021)；吉首大学研究生科研创新项目（JGY201763）

Manipulation of the Electronic Band Structure of Monolayer MoS₂ in Presence of Exchange Field and Off-Resonant Light

ZHANG Xincheng,LIAO Wenhu

(College of Physics and Electromechanical Engineering,Jishou University,Jishou 416000,Hunan China)

Online:2018-05-25 Published:2018-06-27

摘要/Abstract

摘要：

基于紧束缚近似下的低能有效哈密顿模型，研究了外部磁近邻交换场和非共振圆偏振光对单层二硫化钼（MoS₂）电子能带结构的调控.研究结果表明，磁近邻交换场能有效调控导带和价带的自旋劈裂，单层MoS₂ K谷附近能隙随着非共振圆偏振光引起的有效能的增大而增大，K′谷附近能隙随着非共振圆偏振光引起的有效能的增大先减小后增大，实现半导体-金属-半导体转变.因而，可以利用磁近邻交换场和非共振圆偏振光将单层MoS₂调制成自旋和光电特性优异的新带隙材料.

关键词： 二硫化钼, 磁近邻交换场, 非共振圆偏振光, 能带结构

Abstract:

Utilizing the low energy effective Hamilton model from the tight-binding approximation,we have investigated the electronic band structure of the monolayer MoS₂ in the presence of magnetic exchange field and off-resonant circularly polarized light.The obtained results show that,the magnetic exchange field can break and/or modulate the spin degeneracy of the conduction and/or valence bands,and the band gaps around K point of the monolayer MoS₂ increase with the external off-resonant circularly polarized light induced effective energy;while those around K′ increase firstly and then decrease with the light field induced effective energy,realizing the transition of semiconductor-metal-semiconductor.Therefore,the two-dimensional MoS₂ can be tuned to be new bandgap materials with excellent spin and optoelectrical properties.

Key words: MoS₂, magnetic exchange field, off-resonant light, electronic band structure

张新成，廖文虎. 交换场和非共振光对单层MoS₂能带结构的调控[J]. 吉首大学学报（自然科学版）, DOI: 10.3969/j.cnki.jdxb.2018.03.008.

ZHANG Xincheng,LIAO Wenhu. Manipulation of the Electronic Band Structure of Monolayer MoS₂ in Presence of Exchange Field and Off-Resonant Light[J]. Journal of Jishou University（Natural Sciences Edition), DOI: 10.3969/j.cnki.jdxb.2018.03.008.

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交换场和非共振光对单层MoS₂能带结构的调控

Manipulation of the Electronic Band Structure of Monolayer MoS₂ in Presence of Exchange Field and Off-Resonant Light

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