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Long-Lived Valley Polarization of Intra-Valley Trions in Monolayer WSe2
- Source :
- Phys. Rev. Lett. 117, 257402 (2016)
- Publication Year :
- 2016
-
Abstract
- We investigate valley dynamics associated with trions in monolayer tungsten diselenide (WSe2) using polarization resolved two-color pump-probe spectroscopy. When tuning the pump and probe energy across the trion resonance, distinct trion valley polarization dynamics are observed as a function of energy and attributed to the intra-valley and inter-valley trions in monolayer WSe2. We observe no decay of a near-unity valley polarization associated with the intra-valley trions during ~ 25 ps, while the valley polarization of the inter-valley trions exhibits a fast decay of ~ 4 ps. Furthermore, we show that resonant excitation is a prerequisite for observing the long-lived valley polarization associated with the intra-valley trion. The exceptionally robust valley polarization associated with resonantly created intra-valley trions discovered here may be explored for future valleytronic applications such as valley Hall effects.<br />Comment: 4 figures, 7 pages v2 has minor edits over v1, and is the final version of the paper
- Subjects :
- Condensed Matter - Mesoscale and Nanoscale Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Lett. 117, 257402 (2016)
- Publication Type :
- Report
- Accession number :
- edsarx.1608.00038
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.117.257402