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Title: | Brightening of dark excitons in WS2 via tensile strain-induced excitonic valley convergence |
Authors: | CHOWDHURY, TAMAGHNA CHATTERJEE, SAGNIK M. A., GOKUL GHOSH, PRASENJIT RAHMAN, ATIKUR et al. Dept. of Chemistrey |
Keywords: | Monolayer Phonons Photoluminescence Transitions Graphene Films Layer 2024 2024-AUG-WEEK2 TOC-AUG-2024 |
Issue Date: | Aug-2024 |
Publisher: | American Physical Society |
Citation: | Physical Review B, 110(08), L081405. |
Abstract: | Transition-metal dichalcogenides (TMDs) host tightly bound electron-hole pairs—excitons—which can be either optically bright or dark based on spin and momentum selection rules. In tungsten-based TMDs, a momentum-forbidden dark exciton is the energy ground state, and therefore, it strongly affects the emission properties. In this work, we brighten the momentum-forbidden dark exciton by placing monolayer tungsten disulfide on top of nanotextured substrates, which imparts tensile strain, modifying its electronic band structure. This enables phonon-assisted exciton scattering between momentum valleys, thereby brightening momentum-forbidden dark excitons. In addition to offering a tuning knob for light-matter interactions in two-dimensional materials, our results pave the way for designing ultrasensitive strain-sensing devices based on TMDs. |
URI: | https://doi.org/10.1103/PhysRevB.110.L081405 http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/9051 |
ISSN: | 2469-9950 2469-9969 |
Appears in Collections: | JOURNAL ARTICLES |
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