Electrical control of valley polarized charged biexcitons in monolayer WS$_2$
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arXiv
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| Format: | Preprint |
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2024
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| author | Das, Sarthak Huang, Ding Verzhbitskiy, Ivan Ooi, Zi-En Lau, Chit Siong Lee, Rainer Wong, Calvin Pei Yu Goh, Kuan Eng Johnson |
| author_facet | Das, Sarthak Huang, Ding Verzhbitskiy, Ivan Ooi, Zi-En Lau, Chit Siong Lee, Rainer Wong, Calvin Pei Yu Goh, Kuan Eng Johnson |
| contents | Excitons are key to the optoelectronic applications of van der Waals semiconductors with the potential for versatile on-demand tuning of properties. Yet, their electrical manipulation is complicated by their inherent charge neutrality and the additional loss channels induced by electrical doping. We demonstrate the dynamic control of valley polarization in charged biexciton (quinton) states of monolayer tungsten disulfide, achieving up to a sixfold increase in the degree of circular polarization under off-resonant excitation. In contrast to the weak direct tuning of excitons typically observed using electrical gating, the quinton photoluminescence remains stable, even with increased scattering from electron doping. By exciting at the exciton resonances, we observed the reproducible non-monotonic switching of the charged state population as the electron doping is varied under gate bias, indicating a coherent interplay between neutral and charged exciton states. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_09904 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Electrical control of valley polarized charged biexcitons in monolayer WS$_2$ Das, Sarthak Huang, Ding Verzhbitskiy, Ivan Ooi, Zi-En Lau, Chit Siong Lee, Rainer Wong, Calvin Pei Yu Goh, Kuan Eng Johnson Mesoscale and Nanoscale Physics Materials Science Excitons are key to the optoelectronic applications of van der Waals semiconductors with the potential for versatile on-demand tuning of properties. Yet, their electrical manipulation is complicated by their inherent charge neutrality and the additional loss channels induced by electrical doping. We demonstrate the dynamic control of valley polarization in charged biexciton (quinton) states of monolayer tungsten disulfide, achieving up to a sixfold increase in the degree of circular polarization under off-resonant excitation. In contrast to the weak direct tuning of excitons typically observed using electrical gating, the quinton photoluminescence remains stable, even with increased scattering from electron doping. By exciting at the exciton resonances, we observed the reproducible non-monotonic switching of the charged state population as the electron doping is varied under gate bias, indicating a coherent interplay between neutral and charged exciton states. |
| title | Electrical control of valley polarized charged biexcitons in monolayer WS$_2$ |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2404.09904 |