Zeeman-Induced Valley-Sensitive Photocurrent in Monolayer MoS2

Zhang, Xiao -Xiao; Lai, You; Dohner, Emma; Moon, Seongphill; Taniguchi, Takashi; Watanabe, Kenji; Smirnov, Dmitry; Heinz, Tony F.

doi:10.1103/physrevlett.122.127401

Title: Zeeman-Induced Valley-Sensitive Photocurrent in Monolayer ${MoS}_{2}$

Journal Article · Tue Mar 26 00:00:00 EDT 2019 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.122.127401· OSTI ID:1526472

Zhang, Xiao -Xiao ^[1]; Lai, You ^[2]; Dohner, Emma ^[3]; Moon, Seongphill ^[2]; Taniguchi, Takashi ^[4]; Watanabe, Kenji ^[4]; Smirnov, Dmitry ^[5]; Heinz, Tony F. ^[1]

Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Florida State Univ., Tallahassee, FL (United States); National High Magnetic Field Lab., Tallahassee, FL (United States)
Stanford Univ., Stanford, CA (United States)
National Institute for Materials Science, Tsukuba (Japan)
National High Magnetic Field Lab., Tallahassee, FL (United States)

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 B_z. The spin information is also simultaneously determined with spin-sensitive contacts. In the presence of B_z, 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.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-76SF00515; FG02-07ER46451; GBMF4545; DMR-1157490; ECCS-1542152

OSTI ID:: 1526472

Journal Information:: Physical Review Letters, Vol. 122, Issue 12; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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Spin and valley splittings in Janus monolayer WSSe on a MnO(111) surface: Large effective Zeeman field and opening of a helical gap Zhou, Wenzhe; Yang, Zhixiong; Li, Aolin Physical Review B, Vol. 101, Issue 4 https://doi.org/10.1103/physrevb.101.045113	journal	January 2020

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