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Title: Zeeman-Induced Valley-Sensitive Photocurrent in Monolayer MoS 2

Abstract

The control of the valley degree of freedom lies at the core of interest in monolayer transition metal dichalcogenides, where specific valley-spin excitation can be created using circularly polarized light. Measurement and manipulation of the valley index has also been achieved, but mainly with purely optical methods. Here, in monolayer MoS 2, we identify a response to the valley polarization of excitons in the longitudinal electrical transport when the valley degeneracy is broken by an out-of-plane magnetic field Bz. The spin information is also simultaneously determined with spin-sensitive contacts. In the presence of Bz, a significant modulation of the photocurrent is observed as a function of the circular polarization state of the excitation. We attribute this effect to unbalanced transport of valley-polarized trions induced by the opposite Zeeman shifts of two ( K and K') valleys. Furthermore, our interpretation is supported by the contrasting behavior in bilayer MoS 2, as well as the observed doping and spatial dependence of the valley photocurrent.

Authors:
 [1];  [2];  [3];  [2];  [4];  [4];  [5];  [1]
  1. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Florida State Univ., Tallahassee, FL (United States); National High Magnetic Field Lab., Tallahassee, FL (United States)
  3. Stanford Univ., Stanford, CA (United States)
  4. National Institute for Materials Science, Tsukuba (Japan)
  5. National High Magnetic Field Lab., Tallahassee, FL (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1526472
Grant/Contract Number:  
AC02-76SF00515; FG02-07ER46451; GBMF4545; DMR-1157490; ECCS-1542152
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 122; Journal Issue: 12; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Zhang, Xiao -Xiao, Lai, You, Dohner, Emma, Moon, Seongphill, Taniguchi, Takashi, Watanabe, Kenji, Smirnov, Dmitry, and Heinz, Tony F. Zeeman-Induced Valley-Sensitive Photocurrent in Monolayer MoS2. United States: N. p., 2019. Web. doi:10.1103/physrevlett.122.127401.
Zhang, Xiao -Xiao, Lai, You, Dohner, Emma, Moon, Seongphill, Taniguchi, Takashi, Watanabe, Kenji, Smirnov, Dmitry, & Heinz, Tony F. Zeeman-Induced Valley-Sensitive Photocurrent in Monolayer MoS2. United States. doi:10.1103/physrevlett.122.127401.
Zhang, Xiao -Xiao, Lai, You, Dohner, Emma, Moon, Seongphill, Taniguchi, Takashi, Watanabe, Kenji, Smirnov, Dmitry, and Heinz, Tony F. Tue . "Zeeman-Induced Valley-Sensitive Photocurrent in Monolayer MoS2". United States. doi:10.1103/physrevlett.122.127401.
@article{osti_1526472,
title = {Zeeman-Induced Valley-Sensitive Photocurrent in Monolayer MoS2},
author = {Zhang, Xiao -Xiao and Lai, You and Dohner, Emma and Moon, Seongphill and Taniguchi, Takashi and Watanabe, Kenji and Smirnov, Dmitry and Heinz, Tony F.},
abstractNote = {The control of the valley degree of freedom lies at the core of interest in monolayer transition metal dichalcogenides, where specific valley-spin excitation can be created using circularly polarized light. Measurement and manipulation of the valley index has also been achieved, but mainly with purely optical methods. Here, in monolayer MoS2, we identify a response to the valley polarization of excitons in the longitudinal electrical transport when the valley degeneracy is broken by an out-of-plane magnetic field Bz. The spin information is also simultaneously determined with spin-sensitive contacts. In the presence of Bz, a significant modulation of the photocurrent is observed as a function of the circular polarization state of the excitation. We attribute this effect to unbalanced transport of valley-polarized trions induced by the opposite Zeeman shifts of two (K and K') valleys. Furthermore, our interpretation is supported by the contrasting behavior in bilayer MoS2, as well as the observed doping and spatial dependence of the valley photocurrent.},
doi = {10.1103/physrevlett.122.127401},
journal = {Physical Review Letters},
number = 12,
volume = 122,
place = {United States},
year = {2019},
month = {3}
}

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