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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2023
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| Sujets: | |
| Accès en ligne: | https://arxiv.org/abs/2310.06979 |
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| _version_ | 1866916550331596800 |
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| author | Lubert-Perquel, Daphné Cho, Byeong Wook Philips, Alan J. Lee, Young Hee Blackburn, Jeffrey L. Johnson, Justin C. |
| author_facet | Lubert-Perquel, Daphné Cho, Byeong Wook Philips, Alan J. Lee, Young Hee Blackburn, Jeffrey L. Johnson, Justin C. |
| contents | Combining the synthetic tunability of molecular compounds with the optical selection rules of transition metal dichalcogenides (TMDC) that derive from spin-valley coupling could provide interesting opportunities for the readout of quantum information. However, little is known about the electronic and spin interactions at such interfaces and the influence on spin-valley relaxation. In this work, vanadyl phthalocyanine (VOPc) molecular layers are thermally evaporated on WSe$_2$ to explore the effect of molecular layer thickness on excited-state spin-valley polarization. The thinnest molecular layer supports an interfacial state which destroys the spin-valley polarization almost instantaneously, whereas a thicker molecular layer results in longer-lived spin-valley polarization than the WSe$_2$ monolayer alone. The mechanism appears to involve a tightly-bound species at the molecule/TMDC interface that strengthens exchange interactions and is largely avoided in thicker VOPc layers that isolate electrons from WSe$_2$ holes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_06979 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Modulating spin-valley relaxation in WSe$_2$ with variable thickness VOPc layers Lubert-Perquel, Daphné Cho, Byeong Wook Philips, Alan J. Lee, Young Hee Blackburn, Jeffrey L. Johnson, Justin C. Mesoscale and Nanoscale Physics Combining the synthetic tunability of molecular compounds with the optical selection rules of transition metal dichalcogenides (TMDC) that derive from spin-valley coupling could provide interesting opportunities for the readout of quantum information. However, little is known about the electronic and spin interactions at such interfaces and the influence on spin-valley relaxation. In this work, vanadyl phthalocyanine (VOPc) molecular layers are thermally evaporated on WSe$_2$ to explore the effect of molecular layer thickness on excited-state spin-valley polarization. The thinnest molecular layer supports an interfacial state which destroys the spin-valley polarization almost instantaneously, whereas a thicker molecular layer results in longer-lived spin-valley polarization than the WSe$_2$ monolayer alone. The mechanism appears to involve a tightly-bound species at the molecule/TMDC interface that strengthens exchange interactions and is largely avoided in thicker VOPc layers that isolate electrons from WSe$_2$ holes. |
| title | Modulating spin-valley relaxation in WSe$_2$ with variable thickness VOPc layers |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2310.06979 |