Spin splitting in a MoS2  monolayer induced by exciton interaction

Yao Li; Guangyao Li; Xiaokun Zhai; Shifu Xiong; Hongjun Liu; Xiao Wang; Haitao Chen; Ying Gao; Xiu Zhang; Tong Liu; Yuan Ren; Xuekai Ma; Hongbing Fu; Tingge Gao

doi:10.1103/PhysRevB.101.245439

Spin splitting in a MoS2 monolayer induced by exciton interaction

Yao Li, Guangyao Li, Xiaokun Zhai, Shifu Xiong, Hongjun Liu, Xiao Wang, Haitao Chen, Ying Gao, Xiu Zhang, Tong Liu, Yuan Ren, Xuekai Ma, Hongbing Fu, Tingge Gao

School of Physics and Astronomy

Research output: Contribution to journal › Article › Research › peer-review

Abstract

By pumping nonresonantly a MoS2 monolayer at 13 K under a circularly polarized continuous wave (CW) laser, we observe exciton energy redshifts that break the degeneracy between B excitons with opposite spin. The energy splitting increases monotonically with the laser power reaching as much as 18 meV, and it diminishes with the increase of temperature. The phenomenon can be explained theoretically by considering simultaneously the band-gap renormalization that gives rise to the redshift and exciton-exciton Coulomb exchange interaction that is responsible for the spin-dependent splitting. Our results offer a simple scheme to control the valley degree of freedom for MoS2 monolayers and provide an accessible method in investigating the many-body exciton-exciton interaction in such materials.

Original language	English
Number of pages	6
Journal	Physical Review B
Volume	101
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevB.101.245439
Publication status	Published - 25 Jun 2020

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Cite this

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title = "Spin splitting in a MoS2 monolayer induced by exciton interaction",

abstract = "By pumping nonresonantly a MoS2 monolayer at 13 K under a circularly polarized continuous wave (CW) laser, we observe exciton energy redshifts that break the degeneracy between B excitons with opposite spin. The energy splitting increases monotonically with the laser power reaching as much as 18 meV, and it diminishes with the increase of temperature. The phenomenon can be explained theoretically by considering simultaneously the band-gap renormalization that gives rise to the redshift and exciton-exciton Coulomb exchange interaction that is responsible for the spin-dependent splitting. Our results offer a simple scheme to control the valley degree of freedom for MoS2 monolayers and provide an accessible method in investigating the many-body exciton-exciton interaction in such materials.",

author = "Yao Li and Guangyao Li and Xiaokun Zhai and Shifu Xiong and Hongjun Liu and Xiao Wang and Haitao Chen and Ying Gao and Xiu Zhang and Tong Liu and Yuan Ren and Xuekai Ma and Hongbing Fu and Tingge Gao",

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doi = "10.1103/PhysRevB.101.245439",

language = "English",

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TY - JOUR

T1 - Spin splitting in a MoS2 monolayer induced by exciton interaction

AU - Li, Yao

AU - Li, Guangyao

AU - Zhai, Xiaokun

AU - Xiong, Shifu

AU - Liu, Hongjun

AU - Wang, Xiao

AU - Chen, Haitao

AU - Gao, Ying

AU - Zhang, Xiu

AU - Liu, Tong

AU - Ren, Yuan

AU - Ma, Xuekai

AU - Fu, Hongbing

AU - Gao, Tingge

PY - 2020/6/25

Y1 - 2020/6/25

N2 - By pumping nonresonantly a MoS2 monolayer at 13 K under a circularly polarized continuous wave (CW) laser, we observe exciton energy redshifts that break the degeneracy between B excitons with opposite spin. The energy splitting increases monotonically with the laser power reaching as much as 18 meV, and it diminishes with the increase of temperature. The phenomenon can be explained theoretically by considering simultaneously the band-gap renormalization that gives rise to the redshift and exciton-exciton Coulomb exchange interaction that is responsible for the spin-dependent splitting. Our results offer a simple scheme to control the valley degree of freedom for MoS2 monolayers and provide an accessible method in investigating the many-body exciton-exciton interaction in such materials.

AB - By pumping nonresonantly a MoS2 monolayer at 13 K under a circularly polarized continuous wave (CW) laser, we observe exciton energy redshifts that break the degeneracy between B excitons with opposite spin. The energy splitting increases monotonically with the laser power reaching as much as 18 meV, and it diminishes with the increase of temperature. The phenomenon can be explained theoretically by considering simultaneously the band-gap renormalization that gives rise to the redshift and exciton-exciton Coulomb exchange interaction that is responsible for the spin-dependent splitting. Our results offer a simple scheme to control the valley degree of freedom for MoS2 monolayers and provide an accessible method in investigating the many-body exciton-exciton interaction in such materials.

U2 - 10.1103/PhysRevB.101.245439

DO - 10.1103/PhysRevB.101.245439

M3 - Article

SN - 2469-9950

VL - 101

JO - Physical Review B

JF - Physical Review B

IS - 24

ER -