期刊
2D MATERIALS
卷 4, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/aa70f9
关键词
transition-metal dichalcogenides; valley coherence; trions; two-dimensional coherent spectroscopy
资金
- U.S. Department of Energy (DoE), Office of Science, Basic Energy Science (BES) [DE-SC0012670]
- SHINES
- Welch Foundation [F-1473, F-1662]
- NSF [EFMA-1542747]
- Humboldt fellowship
- German Research foundation (DFG) [GRK 1570, KO3612/1-1]
- Directorate For Engineering
- Emerging Frontiers & Multidisciplinary Activities [1542747] Funding Source: National Science Foundation
- U.S. Department of Energy (DOE) [DE-SC0012670] Funding Source: U.S. Department of Energy (DOE)
The emerging field of valleytronics aims to exploit the valley pseudospin of electrons residing near Bloch band extrema as an information carrier. Recent experiments demonstrating optical generation and manipulation of exciton valley coherence (the superposition of electron-hole pairs at opposite valleys) in monolayer transition metal dichalcogenides (TMDs) provide a critical step towards control of this quantum degree of freedom. The charged exciton (trion) in TMDs is an intriguing alternative to the neutral exciton for control of valley pseudospin because of its long spontaneous recombination lifetime, its robust valley polarization, and its coupling to residual electronic spin. Trion valley coherence has however been unexplored due to experimental challenges in accessing it spectroscopically. In this work, we employ ultrafast 2D coherent spectroscopy to resonantly generate and detect trion valley coherence in monolayer MoSe2 demonstrating that it persists for a few-hundred femtoseconds. We conclude that the underlying mechanisms limiting trion valley coherence are fundamentally different from those applicable to exciton valley coherence.
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