12.01.2023Straining of a suspended 2D semiconductor drives different energy states into hybridization, enabling single photon emission
By applying strain on WSe2 membranes with a high degree of control, Dr. Sebastian Heeg and colleagues characterized the different excitonic species present in the material according to their energetic dependence with strain. At certain strain levels, strain-independent defect states and strain dependent dark excitons became energy degenerated and their photoluminescence intensity increased an order of magnitude. “The high tunability of the hybridized state enabled by our device architecture will be likely key for the operation of single quantum emitters in WSe2” highlights Pablo Hernández López, a PhD candidate at Dr. Heeg’s group and co-author of the paper, “On the other hand, the characterization and tuning of the energy hierarchy of the excitons present on suspended materials using our electrostatic straining approach opens the door for more exciting discoveries in the future”.
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Strain control of hybridization between dark and localized excitons in a 2D semiconductor
P. Hernández López, S. Heeg, C. Schattauer, S. Kovalchuk, A. Kumar, D.J. Bock, J.N. Kirchhof, B. Hoefer, K. Greben, D. Yagodkin, L. Linhart, F. Libisch, K.I. Bolotin
Nature Communications, 13, 7691 (2022) OPEN
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DOI: 10.1038/s41467-022-35352-9