Terahertz photocurrent probe of quantum geometry and interactions in magic-angle twisted bilayer graphene
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| author | Kumar, Roshan Krishna Li, Geng Bertini, Riccardo Chaudhary, Swati Nowakowski, Krystian Park, Jeong Min Castilla, Sebastian Zhan, Zhen Pantaleón, Pierre A. Agarwal, Hitesh Battle-Porro, Sergi Icking, Eike Ceccanti, Matteo Reserbat-Plantey, Antoine Piccinini, Giulia Barrier, Julien Khestanova, Ekaterina Taniguchi, Takashi Watanabe, Kenji Stampfer, Christoph Refael, Gil Guinea, Francisco Jarillo-Herrero, Pablo Song, Justin C. W. Stepanov, Petr Lewandowski, Cyprian Koppens, Frank H. L. |
| author_facet | Kumar, Roshan Krishna Li, Geng Bertini, Riccardo Chaudhary, Swati Nowakowski, Krystian Park, Jeong Min Castilla, Sebastian Zhan, Zhen Pantaleón, Pierre A. Agarwal, Hitesh Battle-Porro, Sergi Icking, Eike Ceccanti, Matteo Reserbat-Plantey, Antoine Piccinini, Giulia Barrier, Julien Khestanova, Ekaterina Taniguchi, Takashi Watanabe, Kenji Stampfer, Christoph Refael, Gil Guinea, Francisco Jarillo-Herrero, Pablo Song, Justin C. W. Stepanov, Petr Lewandowski, Cyprian Koppens, Frank H. L. |
| contents | Moiré materials represent strongly interacting electron systems bridging topological and correlated physics. Despite significant advances, decoding wavefunction properties underlying the quantum geometry remains challenging. Here, we utilize polarization-resolved photocurrent measurements to probe magic-angle twisted bilayer graphene, leveraging its sensitivity to the Berry connection that encompasses quantum "textures" of electron wavefunctions. Using terahertz light resonant with optical transitions of its flat bands, we observe bulk photocurrents driven by broken symmetries and reveal the interplay between electron interactions and quantum geometry. We observe inversion-breaking gapped states undetectable through quantum transport, sharp changes in the polarization axes caused by interaction-induced band renormalization, and recurring photocurrent patterns at integer fillings of the moiré unit cell that track the evolution of quantum geometry through the cascade of phase transitions. The large and tunable terahertz response intrinsic to flat-band systems offers direct insights into the quantum geometry of interacting electrons and paves the way for innovative terahertz quantum technologies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_16532 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Terahertz photocurrent probe of quantum geometry and interactions in magic-angle twisted bilayer graphene Kumar, Roshan Krishna Li, Geng Bertini, Riccardo Chaudhary, Swati Nowakowski, Krystian Park, Jeong Min Castilla, Sebastian Zhan, Zhen Pantaleón, Pierre A. Agarwal, Hitesh Battle-Porro, Sergi Icking, Eike Ceccanti, Matteo Reserbat-Plantey, Antoine Piccinini, Giulia Barrier, Julien Khestanova, Ekaterina Taniguchi, Takashi Watanabe, Kenji Stampfer, Christoph Refael, Gil Guinea, Francisco Jarillo-Herrero, Pablo Song, Justin C. W. Stepanov, Petr Lewandowski, Cyprian Koppens, Frank H. L. Mesoscale and Nanoscale Physics Moiré materials represent strongly interacting electron systems bridging topological and correlated physics. Despite significant advances, decoding wavefunction properties underlying the quantum geometry remains challenging. Here, we utilize polarization-resolved photocurrent measurements to probe magic-angle twisted bilayer graphene, leveraging its sensitivity to the Berry connection that encompasses quantum "textures" of electron wavefunctions. Using terahertz light resonant with optical transitions of its flat bands, we observe bulk photocurrents driven by broken symmetries and reveal the interplay between electron interactions and quantum geometry. We observe inversion-breaking gapped states undetectable through quantum transport, sharp changes in the polarization axes caused by interaction-induced band renormalization, and recurring photocurrent patterns at integer fillings of the moiré unit cell that track the evolution of quantum geometry through the cascade of phase transitions. The large and tunable terahertz response intrinsic to flat-band systems offers direct insights into the quantum geometry of interacting electrons and paves the way for innovative terahertz quantum technologies. |
| title | Terahertz photocurrent probe of quantum geometry and interactions in magic-angle twisted bilayer graphene |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2406.16532 |