Robust optical emission polarization in MoS2 monolayers through selective valley excitation

Abstract

We report polarization resolved photoluminescence from monolayer MoS2, a two-dimensional, non-centrosymmetric crystal with direct energy gaps at two different valleys in momentum space. The inherent chiral optical selectivity allows exciting one of these valleys and close to 90% polarized emission at 4K is observed with 40% polarization remaining at 300K. The high polarization degree of the emission remains unchanged in transverse magnetic fields up to 9T indicating robust, selective valley excitation.

5 pages, 3 figures

References in corpus (7)

• Electric Field Effect in Atomically Thin Carbon Films
• The electronic properties of graphene
• Two Dimensional Atomic Crystals
• Valley polarization in MoS2 monolayers by optical pumping
• Substrate-induced band gap opening in epitaxial graphene
• Valley filter and valley valve in graphene
• Valley susceptibility of an interacting two-dimensional electron system

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