Gate-defined superconducting channel in magic-angle twisted bilayer graphene
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arXiv
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| Format: | Preprint |
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2023
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| author | Zheng, Giulia Portolés, Elías Mestre-Torá, Alexandra Perego, Marta Taniguchi, Takashi Watanabe, Kenji Rickhaus, Peter de Vries, Folkert K. Ihn, Thomas Ensslin, Klaus Iwakiri, Shuichi |
| author_facet | Zheng, Giulia Portolés, Elías Mestre-Torá, Alexandra Perego, Marta Taniguchi, Takashi Watanabe, Kenji Rickhaus, Peter de Vries, Folkert K. Ihn, Thomas Ensslin, Klaus Iwakiri, Shuichi |
| contents | Magic-angle twisted bilayer graphene (MATBG) combines in one single material different phases like insulating, metallic and superconducting. These phases and their in-situ tunability make MATBG an important platform for the fabrication of superconducting devices. We realize a split gate-defined geometry which enables us to tune the width of a superconducting channel formed in MATBG. We observe a smooth transition from superconductivity to highly resistive transport by progressively reducing the channel width using the split gates or by reducing the density in the channel. Using the gate-defined constriction, we control the flow of the supercurrent, either guiding it through the constriction or throughout the whole device or even blocking its passage completely. This serves as a foundation for developing quantum constriction devices like superconducting quantum point contacts, quantum dots, and Cooper-pair boxes in MATBG. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_11698 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Gate-defined superconducting channel in magic-angle twisted bilayer graphene Zheng, Giulia Portolés, Elías Mestre-Torá, Alexandra Perego, Marta Taniguchi, Takashi Watanabe, Kenji Rickhaus, Peter de Vries, Folkert K. Ihn, Thomas Ensslin, Klaus Iwakiri, Shuichi Mesoscale and Nanoscale Physics Magic-angle twisted bilayer graphene (MATBG) combines in one single material different phases like insulating, metallic and superconducting. These phases and their in-situ tunability make MATBG an important platform for the fabrication of superconducting devices. We realize a split gate-defined geometry which enables us to tune the width of a superconducting channel formed in MATBG. We observe a smooth transition from superconductivity to highly resistive transport by progressively reducing the channel width using the split gates or by reducing the density in the channel. Using the gate-defined constriction, we control the flow of the supercurrent, either guiding it through the constriction or throughout the whole device or even blocking its passage completely. This serves as a foundation for developing quantum constriction devices like superconducting quantum point contacts, quantum dots, and Cooper-pair boxes in MATBG. |
| title | Gate-defined superconducting channel in magic-angle twisted bilayer graphene |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2312.11698 |