Journal
NATURE NANOTECHNOLOGY
Volume 12, Issue 9, Pages 883-+Publisher
NATURE RESEARCH
DOI: 10.1038/NNANO.2017.105
Keywords
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Funding
- AMOS program, Chemical Sciences, Geosciences, and Biosciences Division, Basic Energy Sciences, US Department of Energy [DE-AC02-76-SFO0515]
- Betty and Gordon Moore Foundation's EPiQS Initiative [GBMF4545]
- Air Force Office of Scientific Research through the MURI Center for dynamic magneto-optics [FA9550-14-1-0040]
- Theory of Materials Program - Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, US Department of Energy [DE-AC02-05CH11231]
- National Science Foundation (NSF) [DMR-1508412]
- Center for Low Energy Systems Technology (LEAST), one of six centres - STARnet phase of the Focus Center Research Program (FCRP), a Semiconductor Research Corporation program
- MARCO
- DARPA
- NSF MRSEC for Precision Assembly of Superstratic and Superatomic Solids [DMR-1420634]
- US Department of Energy [DE-FG02-07ER46451]
- NSF [DMR-1157490]
- State of Florida
- Direct For Mathematical & Physical Scien [1508412] Funding Source: National Science Foundation
- Division Of Materials Research [1508412] Funding Source: National Science Foundation
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Monolayer transition metal dichalcogenide crystals, as direct-gap materials with strong light-matter interactions, have attracted much recent attention. Because of their spin-polarized valence bands and a predicted spin splitting at the conduction band edges, the lowest-lying excitons in WX2 (X = S, Se) are expected to be spin-forbidden and optically dark. To date, however, there has been no direct experimental probe of these dark excitons. Here, we show how an in-plane magnetic field can brighten the dark excitons in monolayer WSe2 and permit their properties to be observed experimentally. Precise energy levels for both the neutral and charged dark excitons are obtained and compared with ab initio calculations using the GW-BSE approach. As a result of their spin configuration, the brightened dark excitons exhibit much-increased emission and valley lifetimes. These studies directly probe the excitonic spin manifold and reveal the fine spin-splitting at the conduction band edges.
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