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Zeeman-Induced Valley-Sensitive Photocurrent in Monolayer MoS2

Xiao-Xiao Zhang, You Lai, Emma Dohner, Seongphill Moon, Takashi Taniguchi, Kenji Watanabe, Dmitry Smirnov, and Tony F. Heinz
Phys. Rev. Lett. 122, 127401 – Published 26 March 2019
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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. 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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  • Received 12 August 2018
  • Revised 24 December 2018

DOI:https://doi.org/10.1103/PhysRevLett.122.127401

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Xiao-Xiao Zhang1,2, You Lai3,4, Emma Dohner5, Seongphill Moon3,4, Takashi Taniguchi6, Kenji Watanabe6, Dmitry Smirnov4, and Tony F. Heinz1,2,*

  • 1Department of Applied Physics, Stanford University, Stanford, California 94305, USA
  • 2SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
  • 3Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
  • 4National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA
  • 5Department of Chemistry, Stanford University, Stanford, California 94305, USA
  • 6National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan

  • *corresponding author. tony.heinz@stanford.edu

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Issue

Vol. 122, Iss. 12 — 29 March 2019

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