Optical manipulation and electrical control of valley pseudo-spins in atomically thin semiconductors

Sanfeng Wu, Jason S. Ross, Chunming Huang, Nirmal J. Ghimire, Jiaqiang Yan, David G. Mandrus, Di Xiao, Wang Yao, David H. Cobden, Xiaodong Xu

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Electronic valleys are energy extrema of Bloch bands in momentum space. In analogy to electrons with spin degrees of freedom, valley indices can be considered as pseudo-spins for new modes of electronic and photonic device operation. In this paper, we will review our experimental progress on the investigation of these pseudo-spins using atomically thin semiconductors (MoS2, MoSe2 etc.), which are either monolayer or bilayer group VI transition metal dichalcogenides. We will show that these new 2D semiconductors not only behave as remarkable excitonic systems, but also provide an ideal platform for realizing the optical manipulation and electrical control of valley degrees of freedom.

Original languageEnglish (US)
Title of host publicationSpintronics VI
StatePublished - 2013
Externally publishedYes
Event6th Spintronics Symposium - San Diego, CA, United States
Duration: Aug 25 2013Aug 29 2013

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


Conference6th Spintronics Symposium
Country/TerritoryUnited States
CitySan Diego, CA

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


  • 2D semiconductor
  • exciton
  • transition metal dichalcogenides
  • valley pseudospin


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