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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2405.09119 |
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| _version_ | 1866914796741328896 |
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| author | Pandeya, Ram Prakash Shchukin, Konstantin P. Falke, Yannic Mussler, Gregor Rehman, Jalil Abdur Atodiresei, Nicolae Fedorov, Alexander V. Senkovskiy, Boris V. Jansen, Daniel Di Santo, Giovanni Petaccia, Luca Grüneis, Alexander |
| author_facet | Pandeya, Ram Prakash Shchukin, Konstantin P. Falke, Yannic Mussler, Gregor Rehman, Jalil Abdur Atodiresei, Nicolae Fedorov, Alexander V. Senkovskiy, Boris V. Jansen, Daniel Di Santo, Giovanni Petaccia, Luca Grüneis, Alexander |
| contents | We synthesize and spectroscopically investigate monolayer C$_{60}$ on the topological insulator (TI) Bi$_4$Te$_3$. This C$_{60}$/Bi$_4$Te$_3$ heterostructure is characterized by excellent translational order in a novel (4 x 4) C$_{60}$ superstructure on a (9 x 9) unit of Bi$_4$Te$_3$. We measure the full two-dimensional energy band structure of C$_{60}$/Bi$_4$Te$_3$ using angle-resolved photoemission spectroscopy (ARPES). We find that C$_{60}$ accepts electrons from the TI at room temperature but no charge transfer occurs at low temperatures. We unravel this peculiar behaviour by Raman spectroscopy of C$_{60}$/Bi$_4$Te$_3$ and density functional theory (DFT) calculations of the electronegativity of C$_{60}$. Both methods are sensitive to orientational order of C$_{60}$. At low temperatures, Raman spectroscopy shows a dramatic intensity increase of the C$_{60}$ Raman signal, evidencing a transition to a rotationally ordered state. DFT reveals that the orientational order of C$_{60}$ at low temperatures has a higher electron affinity than at high temperatures. These results neatly explain the temperature-dependent charge transfer observed in ARPES. Our conclusions are supported by the appearance of a strong photoluminescence from C$_{60}$/Bi$_4$Te$_3$ at low temperatures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_09119 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Molecular order induced charge transfer in a C$_{60}$-topological insulator moiré heterostructure Pandeya, Ram Prakash Shchukin, Konstantin P. Falke, Yannic Mussler, Gregor Rehman, Jalil Abdur Atodiresei, Nicolae Fedorov, Alexander V. Senkovskiy, Boris V. Jansen, Daniel Di Santo, Giovanni Petaccia, Luca Grüneis, Alexander Materials Science We synthesize and spectroscopically investigate monolayer C$_{60}$ on the topological insulator (TI) Bi$_4$Te$_3$. This C$_{60}$/Bi$_4$Te$_3$ heterostructure is characterized by excellent translational order in a novel (4 x 4) C$_{60}$ superstructure on a (9 x 9) unit of Bi$_4$Te$_3$. We measure the full two-dimensional energy band structure of C$_{60}$/Bi$_4$Te$_3$ using angle-resolved photoemission spectroscopy (ARPES). We find that C$_{60}$ accepts electrons from the TI at room temperature but no charge transfer occurs at low temperatures. We unravel this peculiar behaviour by Raman spectroscopy of C$_{60}$/Bi$_4$Te$_3$ and density functional theory (DFT) calculations of the electronegativity of C$_{60}$. Both methods are sensitive to orientational order of C$_{60}$. At low temperatures, Raman spectroscopy shows a dramatic intensity increase of the C$_{60}$ Raman signal, evidencing a transition to a rotationally ordered state. DFT reveals that the orientational order of C$_{60}$ at low temperatures has a higher electron affinity than at high temperatures. These results neatly explain the temperature-dependent charge transfer observed in ARPES. Our conclusions are supported by the appearance of a strong photoluminescence from C$_{60}$/Bi$_4$Te$_3$ at low temperatures. |
| title | Molecular order induced charge transfer in a C$_{60}$-topological insulator moiré heterostructure |
| topic | Materials Science |
| url | https://arxiv.org/abs/2405.09119 |