2012/06/30 by G. Sallen, L. Bouet, X. Marie +8 · 1 citation
Physics and Astronomy · #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.86.081301
published as Physical Review B 86, 081301(R) (2012) · 5 pages, 3 figures
arxiv created 2012/08/09 · arxiv updated 2012/08/10
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.