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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 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.

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)
OSTI Identifier:
1526472
Grant/Contract Number:  
AC02-76SF00515; FG02-07ER46451; GBMF4545; DMR-1157490; ECCS-1542152
Resource Type:
Journal Article: 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. https://doi.org/10.1103/physrevlett.122.127401
Zhang, Xiao -Xiao, Lai, You, Dohner, Emma, Moon, Seongphill, Taniguchi, Takashi, Watanabe, Kenji, Smirnov, Dmitry, and Heinz, Tony F. 2019. "Zeeman-Induced Valley-Sensitive Photocurrent in Monolayer MoS2". United States. https://doi.org/10.1103/physrevlett.122.127401. https://www.osti.gov/servlets/purl/1526472.
@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},
url = {https://www.osti.gov/biblio/1526472}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 12,
volume = 122,
place = {United States},
year = {Tue Mar 26 00:00:00 EDT 2019},
month = {Tue Mar 26 00:00:00 EDT 2019}
}

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Cited by: 18 works
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Works referenced in this record:

Coupled Spin and Valley Physics in Monolayers of MoS 2 and Other Group-VI Dichalcogenides
journal, May 2012


Elucidating the Photoresponse of Ultrathin MoS 2 Field-Effect Transistors by Scanning Photocurrent Microscopy
journal, July 2013


Spatially Resolved Photoexcited Charge-Carrier Dynamics in Phase-Engineered Monolayer MoS 2
journal, January 2015


Valley-dependent magnetoresistance in two-dimensional semiconductors
journal, May 2018


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journal, January 2016


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journal, July 2015


Optical generation of excitonic valley coherence in monolayer WSe2
journal, August 2013


Even–odd layer-dependent magnetotransport of high-mobility Q-valley electrons in transition metal disulfides
journal, September 2016


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journal, April 2014


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journal, January 2003


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journal, September 2016


Generation and electric control of spin–valley-coupled circular photogalvanic current in WSe2
journal, September 2014


Manipulating spin-polarized photocurrents in 2D transition metal dichalcogenides
journal, March 2016


Optical Control of Spin Polarization in Monolayer Transition Metal Dichalcogenides
journal, January 2017


k · p theory for two-dimensional transition metal dichalcogenide semiconductors
journal, April 2015


Electrical Tuning of Exciton Binding Energies in Monolayer WS 2
journal, September 2015


Valley-Contrasting Physics in Graphene: Magnetic Moment and Topological Transport
journal, December 2007


Long-lived nanosecond spin relaxation and spin coherence of electrons in monolayer MoS2 and WS2
journal, August 2015


Gate-Controlled Spin-Valley Locking of Resident Carriers in WSe 2 Monolayers
journal, September 2017


Exciton diamagnetic shifts and valley Zeeman effects in monolayer WS2 and MoS2 to 65 Tesla
journal, February 2016


The valley Hall effect in MoS2 transistors
journal, June 2014


Valley-selective circular dichroism of monolayer molybdenum disulphide
journal, January 2012


Van der Waals engineering of ferromagnetic semiconductor heterostructures for spin and valleytronics
journal, May 2017


Enhanced valley splitting in monolayer WSe2 due to magnetic exchange field
journal, May 2017


Theory of neutral and charged excitons in monolayer transition metal dichalcogenides
journal, July 2013


Fundamental obstacle for electrical spin injection from a ferromagnetic metal into a diffusive semiconductor
journal, August 2000


Control of valley polarization in monolayer MoS2 by optical helicity
journal, June 2012


Valley polarization in MoS2 monolayers by optical pumping
journal, June 2012


Works referencing / citing this record:

Tuning valley polarization in two-dimensional ferromagnetic heterostructures
journal, January 2019