Giant chirality-induced spin polarization in twisted transition metal dichalcogenides
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arXiv
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| Format: | Preprint |
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2023
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| author | Menichetti, Guido Cavicchi, Lorenzo Lucchesi, Leonardo Taddei, Fabio Iannaccone, Giuseppe Jarillo-Herrero, Pablo Felser, Claudia Koppens, Frank H. L. Polini, Marco |
| author_facet | Menichetti, Guido Cavicchi, Lorenzo Lucchesi, Leonardo Taddei, Fabio Iannaccone, Giuseppe Jarillo-Herrero, Pablo Felser, Claudia Koppens, Frank H. L. Polini, Marco |
| contents | Chirality-induced spin selectivity (CISS) is an effect that has recently attracted a great deal of attention in chiral chemistry and that remains to be understood. In the CISS effect, electrons passing through chiral molecules acquire a large degree of spin polarization. In this work we study the case of atomically-thin chiral crystals created by van der Waals assembly. We show that this effect can be spectacularly large in systems containing just two monolayers, provided they are spin-orbit coupled. Its origin stems from the combined effects of structural chirality and spin-flipping spin-orbit coupling. We present detailed calculations for twisted homobilayer transition metal dichalcogenides, showing that the chirality-induced spin polarization can be giant, e.g. easily exceeding $50\%$ for ${\rm MoTe}_2$. Our results clearly indicate that twisted quantum materials can operate as a fully tunable platform for the study and control of the CISS effect in condensed matter physics and chiral chemistry. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_09169 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Giant chirality-induced spin polarization in twisted transition metal dichalcogenides Menichetti, Guido Cavicchi, Lorenzo Lucchesi, Leonardo Taddei, Fabio Iannaccone, Giuseppe Jarillo-Herrero, Pablo Felser, Claudia Koppens, Frank H. L. Polini, Marco Mesoscale and Nanoscale Physics Materials Science Chirality-induced spin selectivity (CISS) is an effect that has recently attracted a great deal of attention in chiral chemistry and that remains to be understood. In the CISS effect, electrons passing through chiral molecules acquire a large degree of spin polarization. In this work we study the case of atomically-thin chiral crystals created by van der Waals assembly. We show that this effect can be spectacularly large in systems containing just two monolayers, provided they are spin-orbit coupled. Its origin stems from the combined effects of structural chirality and spin-flipping spin-orbit coupling. We present detailed calculations for twisted homobilayer transition metal dichalcogenides, showing that the chirality-induced spin polarization can be giant, e.g. easily exceeding $50\%$ for ${\rm MoTe}_2$. Our results clearly indicate that twisted quantum materials can operate as a fully tunable platform for the study and control of the CISS effect in condensed matter physics and chiral chemistry. |
| title | Giant chirality-induced spin polarization in twisted transition metal dichalcogenides |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2312.09169 |