Tensile strain induced brightening of momentum forbidden dark exciton in WS$_2$
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arXiv
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| Auteurs principaux: | , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2023
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| _version_ | 1866911983412969472 |
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| author | Chowdhury, Tamaghna Chatterjee, Sagnik Das, Dibyasankar Timokhin, Ivan Núñez, Pablo Díaz A., Gokul M. Chatterjee, Suman Majumdar, Kausik Ghosh, Prasenjit Mishchenko, Artem Rahman, Atikur |
| author_facet | Chowdhury, Tamaghna Chatterjee, Sagnik Das, Dibyasankar Timokhin, Ivan Núñez, Pablo Díaz A., Gokul M. Chatterjee, Suman Majumdar, Kausik Ghosh, Prasenjit Mishchenko, Artem Rahman, Atikur |
| contents | Transition-metal dichalcogenides (TMDs) host tightly bound quasi-particles called excitons. Based on spin and momentum selection rules, these excitons can be either optically bright or dark. In tungsten-based TMDs, momentum-forbidden dark exciton is the energy ground state and therefore it strongly affect the emission properties. In this work, we brighten the momentum forbidden dark exciton by placing WS$_2$ on top of nanotextured substrates which put the WS$_2$ layer under tensile strain, modifying electronic bandstructure. This enables phonon assisted scattering of exciton between momentum valleys, thereby brightening momentum forbidden dark excitons. Our results will pave the way to design ultrasensitive strain sensing devices based on TMDs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_16041 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Tensile strain induced brightening of momentum forbidden dark exciton in WS$_2$ Chowdhury, Tamaghna Chatterjee, Sagnik Das, Dibyasankar Timokhin, Ivan Núñez, Pablo Díaz A., Gokul M. Chatterjee, Suman Majumdar, Kausik Ghosh, Prasenjit Mishchenko, Artem Rahman, Atikur Mesoscale and Nanoscale Physics Materials Science Transition-metal dichalcogenides (TMDs) host tightly bound quasi-particles called excitons. Based on spin and momentum selection rules, these excitons can be either optically bright or dark. In tungsten-based TMDs, momentum-forbidden dark exciton is the energy ground state and therefore it strongly affect the emission properties. In this work, we brighten the momentum forbidden dark exciton by placing WS$_2$ on top of nanotextured substrates which put the WS$_2$ layer under tensile strain, modifying electronic bandstructure. This enables phonon assisted scattering of exciton between momentum valleys, thereby brightening momentum forbidden dark excitons. Our results will pave the way to design ultrasensitive strain sensing devices based on TMDs. |
| title | Tensile strain induced brightening of momentum forbidden dark exciton in WS$_2$ |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2312.16041 |