Enhancing and controlling valley magnetic response in MoS2/WS2 heterostructures by all-optical route

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • Jing Zhang
  • Luojun Du

  • Shun Feng
  • Run Wu Zhang
  • Bingchen Cao
  • Chenji Zou
  • Yu Chen
  • Mengzhou Liao
  • Baile Zhang
  • Shengyuan A. Yang
  • Guangyu Zhang
  • Ting Yu

Research units

  • CAS - Changchun Institute of Optics Fine Mechanics and Physics
  • Singapore University of Technology and Design
  • Beijing Institute of Technology
  • Nanyang Technological University

Abstract

Van der Waals heterostructures of transition metal dichalcogenides with interlayer coupling offer an exotic platform to realize fascinating phenomena. Due to the type II band alignment of these heterostructures, electrons and holes are separated into different layers. The localized electrons induced doping in one layer, in principle, would lift the Fermi level to cross the spin-polarized upper conduction band and lead to strong manipulation of valley magnetic response. Here, we report the significantly enhanced valley Zeeman splitting and magnetic tuning of polarization for the direct optical transition of MoS2 in MoS2/WS2 heterostructures. Such strong enhancement of valley magnetic response in MoS2 stems from the change of the spin-valley degeneracy from 2 to 4 and strong many-body Coulomb interactions induced by ultrafast charge transfer. Moreover, the magnetic splitting can be tuned monotonically by laser power, providing an effective all-optical route towards engineering and manipulating of valleytronic devices and quantum-computation.

Details

Original languageEnglish
JournalNature Communications
Volume10
Issue number1
Publication statusPublished - 17 Sep 2019
MoE publication typeA1 Journal article-refereed

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