Journal
PHYSICAL REVIEW LETTERS
Volume 117, Issue 25, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.117.257402
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Funding
- NSF [DMR-1306878, EFMA-1542747]
- SHINES, Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Science, Basic Energy Science (BES) [DE-SC0012670]
- SHINES
- Alexander von Humboldt foundation
- Deutsche Forschungsgemeinschaft [GRK 1558]
- Directorate For Engineering
- Emerging Frontiers & Multidisciplinary Activities [1542747] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1306878] Funding Source: National Science Foundation
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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 intravalley and intervalley trions in monolayer WSe2. We observe no decay of a near-unity valley polarization associated with the intravalley trions during similar to 25 ps, while the valley polarization of the intervalley trions exhibits a fast decay of similar to 4 ps. Furthermore, we show that resonant excitation is a prerequisite for observing the long-lived valley polarization associated with the intravalley trion. The exceptionally robust valley polarization associated with resonantly created intravalley trions discovered here may be explored for future valleytronic applications such as valley Hall effects.
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