Signature of gate tunable superconducting network in twisted bilayer graphene
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| author | Wang, Yingbo Han, Yingzhuo Cao, Lu Luo, Xun-Jiang Xue, Yucheng Shi, Jiefei Wang, Xiaomeng Bai, Xiangjia Jiang, Junnan Tian, Ziyi Watanabe, Kenji Taniguchi, Takashi Wu, Fengcheng Sun, Qing-feng Gao, Hong-Jun Jiang, Yuhang Mao, Jinhai |
| author_facet | Wang, Yingbo Han, Yingzhuo Cao, Lu Luo, Xun-Jiang Xue, Yucheng Shi, Jiefei Wang, Xiaomeng Bai, Xiangjia Jiang, Junnan Tian, Ziyi Watanabe, Kenji Taniguchi, Takashi Wu, Fengcheng Sun, Qing-feng Gao, Hong-Jun Jiang, Yuhang Mao, Jinhai |
| contents | Twisted van der Waals materials provide a tunable platform for investigating two-dimensional superconductivity and quantum phases. Using spectra-imaging scanning tunneling microscopy, we study the superconducting states in twisted bilayer graphene and track their evolution from insulating phases. Gate-dependent spectroscopic measurements reveal two distinct regimes: under-doped (ν = -2.3) and optimally doped (ν = -2.6). In the under-doped regime, partial superconductivity arises, forming a network interspersed with non-gapped regions. At optimal doping, the entire unit cell demonstrates superconductivity, with gap size modulation showing an anti-correlation with the local density of states. This gate-dependent transition from an insulating phase to a modulated superconductor uncovers an unexpected spatial hierarchy in pairing behavior and offers direct microscopic insights to constrain theories of superconductivity in moiré systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_04287 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Signature of gate tunable superconducting network in twisted bilayer graphene Wang, Yingbo Han, Yingzhuo Cao, Lu Luo, Xun-Jiang Xue, Yucheng Shi, Jiefei Wang, Xiaomeng Bai, Xiangjia Jiang, Junnan Tian, Ziyi Watanabe, Kenji Taniguchi, Takashi Wu, Fengcheng Sun, Qing-feng Gao, Hong-Jun Jiang, Yuhang Mao, Jinhai Superconductivity Mesoscale and Nanoscale Physics Strongly Correlated Electrons Twisted van der Waals materials provide a tunable platform for investigating two-dimensional superconductivity and quantum phases. Using spectra-imaging scanning tunneling microscopy, we study the superconducting states in twisted bilayer graphene and track their evolution from insulating phases. Gate-dependent spectroscopic measurements reveal two distinct regimes: under-doped (ν = -2.3) and optimally doped (ν = -2.6). In the under-doped regime, partial superconductivity arises, forming a network interspersed with non-gapped regions. At optimal doping, the entire unit cell demonstrates superconductivity, with gap size modulation showing an anti-correlation with the local density of states. This gate-dependent transition from an insulating phase to a modulated superconductor uncovers an unexpected spatial hierarchy in pairing behavior and offers direct microscopic insights to constrain theories of superconductivity in moiré systems. |
| title | Signature of gate tunable superconducting network in twisted bilayer graphene |
| topic | Superconductivity Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2507.04287 |