Generation and electric control of spin-valley-coupled circular photogalvanic current in WSe2

Hongtao Yuan, Xinqiang Wang, Biao Lian, Haijun Zhang, Xianfa Fang, Bo Shen, Gang Xu, Yong Xu, Shou Cheng Zhang, Harold Y. Hwang, Yi Cui

Research output: Contribution to journalArticlepeer-review

198 Scopus citations

Abstract

The valley degree of freedom in layered transition-metal dichalcogenides provides an opportunity to extend the functionalities of spintronics and valleytronics devices. The achievement of spin-coupled valley polarization induced by the non-equilibrium charge-carrier imbalance between two degenerate and inequivalent valleys has been demonstrated theoretically and by optical experiments. However, the generation of a valley and spin current with the valley polarization in transition-metal dichalcogenides remains elusive. Here we demonstrate a spin-coupled valley photocurrent, within an electric-double-layer transistor based on WSe2, whose direction and magnitude depend on the degree of circular polarization of the incident radiation and can be further modulated with an external electric field. This room-temperature generation and electric control of a valley and spin photocurrent provides a new property of electrons in transition-metal dichalcogenide systems, and thereby enables additional degrees of control for quantum-confined spintronic devices.

Original languageEnglish (US)
Pages (from-to)851-857
Number of pages7
JournalNature Nanotechnology
Volume9
Issue number10
DOIs
StatePublished - Jan 1 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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