Journal
PHYSICAL REVIEW B
Volume 98, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.98.115308
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Funding
- National Science Foundation's MRSEC program through Columbia in the Center for Precision Assembly of Superstratic and Superatomic Solids [DMR-1420634]
- Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC02-76SF00515]
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We investigate excitonic absorption and emission in monolayer (1L) WSe2 under tensile strain. We observe a redshift of 100 meV in the A exciton energy and a decrease of 25 meV in its estimated binding energy under 2.1% strain. Surprisingly, the linewidth of the A exciton decreases by almost a factor of two under strain, from 42 to 24 meV at room temperature. We explain this effect as the result of suppression of phonon-mediated exciton scattering channels. We show that such a suppression results from the relative shift under strain of a secondary valley in the conduction band that is nearly degenerate with the K valley where the A exciton is formed.
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