Experimental detection of vortices in magic-angle graphene
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arXiv
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866911558905364480 |
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| author | Perego, Marta Agero, Clara Galante Torà, Alexandra Mestre Portolés, Elías Denisov, Artem O. Taniguchi, Takashi Watanabe, Kenji Gaggioli, Filippo Geshkenbein, Vadim Blatter, Gianni Ihn, Thomas Ensslin, Klaus |
| author_facet | Perego, Marta Agero, Clara Galante Torà, Alexandra Mestre Portolés, Elías Denisov, Artem O. Taniguchi, Takashi Watanabe, Kenji Gaggioli, Filippo Geshkenbein, Vadim Blatter, Gianni Ihn, Thomas Ensslin, Klaus |
| contents | The tunability of superconducting magic-angle twisted-layer graphene films elevates this material system to a promising candidate for superconducting electronics. We implement a gate-tuned Josephson junction in a magic-angle twisted four-layer graphene film. Field-dependent measurements of the critical current show a Fraunhofer-like pattern that differs from the standard pattern with characteristics typical for a weak transverse screener. We observe sudden shifts associated with vortices jumping into and out of the leads. By tuning the leads to the edge of the superconducting dome, we observe fast switching between superconducting and normal states, an effect associated with vortex dynamics. Time-dependent measurements provide us with the vortex energy scale and an estimate for the London penetration depth, in agreement with recent kinetic inductance measurements on twisted graphene films. Our results prove the utility of our junction as a sensor for vortex detection, allowing us to extract fundamental properties of the 2D superconductor. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_03508 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Experimental detection of vortices in magic-angle graphene Perego, Marta Agero, Clara Galante Torà, Alexandra Mestre Portolés, Elías Denisov, Artem O. Taniguchi, Takashi Watanabe, Kenji Gaggioli, Filippo Geshkenbein, Vadim Blatter, Gianni Ihn, Thomas Ensslin, Klaus Mesoscale and Nanoscale Physics The tunability of superconducting magic-angle twisted-layer graphene films elevates this material system to a promising candidate for superconducting electronics. We implement a gate-tuned Josephson junction in a magic-angle twisted four-layer graphene film. Field-dependent measurements of the critical current show a Fraunhofer-like pattern that differs from the standard pattern with characteristics typical for a weak transverse screener. We observe sudden shifts associated with vortices jumping into and out of the leads. By tuning the leads to the edge of the superconducting dome, we observe fast switching between superconducting and normal states, an effect associated with vortex dynamics. Time-dependent measurements provide us with the vortex energy scale and an estimate for the London penetration depth, in agreement with recent kinetic inductance measurements on twisted graphene films. Our results prove the utility of our junction as a sensor for vortex detection, allowing us to extract fundamental properties of the 2D superconductor. |
| title | Experimental detection of vortices in magic-angle graphene |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2410.03508 |