Valley-selective circular dichroism of monolayer molybdenum disulphide View Full Text


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Article Info

DATE

2012-01

AUTHORS

Ting Cao, Gang Wang, Wenpeng Han, Huiqi Ye, Chuanrui Zhu, Junren Shi, Qian Niu, Pingheng Tan, Enge Wang, Baoli Liu, Ji Feng

ABSTRACT

A two-dimensional honeycomb lattice harbours a pair of inequivalent valleys in the k-space electronic structure, in the vicinities of the vertices of a hexagonal Brillouin zone, K(±). It is particularly appealing to exploit this emergent degree of freedom of charge carriers, in what is termed 'valleytronics'. The physics of valleys mimics that of spin, and will make possible devices, analogous to spintronics, such as valley filter and valve, and optoelectronic Hall devices, all very promising for next-generation electronics. The key challenge lies with achieving valley polarization, of which a convincing demonstration in a two-dimensional honeycomb structure remains evasive. Here we show, using first principles calculations, that monolayer molybdenum disulphide is an ideal material for valleytronics, for which valley polarization is achievable via valley-selective circular dichroism arising from its unique symmetry. We also provide experimental evidence by measuring the circularly polarized photoluminescence on monolayer molybdenum disulphide, which shows up to 50% polarization. More... »

PAGES

887

References to SciGraph publications

  • 2007-03. Valley filter and valley valve in graphene in NATURE PHYSICS
  • 2012-01. Field-induced polarization of Dirac valleys in bismuth in NATURE PHYSICS
  • 2011-03. Single-layer MoS2 transistors in NATURE NANOTECHNOLOGY
  • 2007-10. Substrate-induced bandgap opening in epitaxial graphene in NATURE MATERIALS
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    http://scigraph.springernature.com/pub.10.1038/ncomms1882

    DOI

    http://dx.doi.org/10.1038/ncomms1882

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1049548334

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/22673914


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