Tunable magneto-optical properties in MoS$_2$ via defect-induced exciton transitions
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2022
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| _version_ | 1866911777892073472 |
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| author | Amit, Tomer Hernangómez-Pérez, Daniel Cohen, Galit Qiu, Diana Y. Refaely-Abramson, Sivan |
| author_facet | Amit, Tomer Hernangómez-Pérez, Daniel Cohen, Galit Qiu, Diana Y. Refaely-Abramson, Sivan |
| contents | The presence of chalcogen vacancies in monolayer transition metal dichalcogenides (TMDs) leads to excitons with mixed localized-delocalized character and to reduced valley selectivity. Recent experimental advances in defect design in TMDs allow for a close examination of such mixed exciton states as a function of their degree of circular polarization under external magnetic fields, revealing strongly varying defect-induced magnetic properties. A theoretical understanding of these observations and their physical origins demands a predictive, structure-sensitive theory. In this work, we study the effect of chalcogen vacancies on the exciton magnetic properties in monolayer MoS$_2$. Using many-body perturbation theory, we show how the complex excitonic picture associated with the presence of defects -- with reduced valley and spin selectivity due to hybridized electron-hole transitions -- leads to structurally-controllable exciton magnetic response. We find a variety of g-factors with changing magnitudes and sign depending on the exciton energy and character. Our findings suggest a pathway to tune the nature of the excitons -- and by that their magneto-optical properties -- through defect architecture. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2203_14125 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Tunable magneto-optical properties in MoS$_2$ via defect-induced exciton transitions Amit, Tomer Hernangómez-Pérez, Daniel Cohen, Galit Qiu, Diana Y. Refaely-Abramson, Sivan Materials Science The presence of chalcogen vacancies in monolayer transition metal dichalcogenides (TMDs) leads to excitons with mixed localized-delocalized character and to reduced valley selectivity. Recent experimental advances in defect design in TMDs allow for a close examination of such mixed exciton states as a function of their degree of circular polarization under external magnetic fields, revealing strongly varying defect-induced magnetic properties. A theoretical understanding of these observations and their physical origins demands a predictive, structure-sensitive theory. In this work, we study the effect of chalcogen vacancies on the exciton magnetic properties in monolayer MoS$_2$. Using many-body perturbation theory, we show how the complex excitonic picture associated with the presence of defects -- with reduced valley and spin selectivity due to hybridized electron-hole transitions -- leads to structurally-controllable exciton magnetic response. We find a variety of g-factors with changing magnitudes and sign depending on the exciton energy and character. Our findings suggest a pathway to tune the nature of the excitons -- and by that their magneto-optical properties -- through defect architecture. |
| title | Tunable magneto-optical properties in MoS$_2$ via defect-induced exciton transitions |
| topic | Materials Science |
| url | https://arxiv.org/abs/2203.14125 |