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Valley-Polarized Exciton-Polaritons in a Monolayer Semiconductor
- Source :
- Nature Photonics, 11, 431-435 (2017)
- Publication Year :
- 2017
-
Abstract
- Single layers of transition metal dichalcogenides are two-dimensional direct bandgap semiconductors with degenerate, but inequivalent, `valleys' in the electronic structure that can be selectively excited by polarized light. Coherent superpositions of light and matter, exciton-polaritons, have been observed when these materials are strongly coupled to photons, but these hybrid quasiparticles do not harness the valley-sensitive excitations of monolayer transition metal dichalcogenides. Here, we demonstrate evidence for valley polarized exciton-polaritons in monolayers of MoS$_2$ embedded in a dielectric microcavity. Unlike traditional microcavity exciton-polaritons, these light-matter quasiparticles emit polarized light with spectral Rabi splitting. The interplay of cavity-modified exciton dynamics and intervalley relaxation in the high-cooperativity regime causes valley polarized exciton-polaritons to persist to room temperature, distinct from the vanishing polarization in bare monolayers. Achieving polarization-sensitive polaritonic devices operating at room temperature presents a pathway for manipulating novel valley degrees of freedom in coherent states of light and matter.<br />Comment: 8 pages, 4 figures, and Supplementary Information
- Subjects :
- Condensed Matter - Materials Science
Physics - Optics
Subjects
Details
- Database :
- arXiv
- Journal :
- Nature Photonics, 11, 431-435 (2017)
- Publication Type :
- Report
- Accession number :
- edsarx.1701.05579
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1038/nphoton.2017.86