Robust optical emission polarization in MoS2 monolayers through selective valley excitation
By G. Sallen, L. Bouet, Xavier Marie, Gang Wang, C. Zhu, W. Han, Yuan Lu, P. Tan, T. Amand, Baoli Liu and 1 more. 2012
349 citations recorded by the source corpus.
We report polarization resolved photoluminescence from monolayer MoS2, a two-dimensional, noncentrosymmetric 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 4 K is observed with 40% polarization remaining at 300 K. The high polarization degree of the emission remains unchanged in transverse magnetic fields up to 9 T indicating robust, selective valley excitation.
Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/f038b56156fa427a738ea111c82d061c062b4596
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In Atomic and Molecular Physics, and Optics
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Citations in the corpus
- Stability and electronic structures of native defects in single-layer MoS 2 (2014, background): “Besides the large electronic correlation effects, the intrinsic broken inversion symmetry of the single-layer MoS2 induces the spin-orbit split bands at K and -K points in the hexagonal Brillouin zone [11] and opens the new era of the spin- and valley-controlled electronics [12–16].”
- Few-layer MoS2: a promising layered semiconductor. (2014, background): “Higher temperatures also lowered polarized emission from samples.(138) Recent experiments showed the control and tuning of circularly polarized photoluminescence from bilayer MoS2 with the application of a gate voltage, attributed to the breaking of inversion symmetry in bilayer MoS2 under the elect”
- Valley excitons in two-dimensional semiconductors (2015, background): “Experimentally, it has been shown that the exciton valley polarization in monolayer MoS2 has no response to in-plane magnetic field up to 9 T [28,69].”