Large tunable kinetic inductance in a twisted graphene superconductor
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866929264205496320 |
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| author | Jha, Rounak Endres, Martin Watanabe, Kenji Taniguchi, Takashi Banerjee, Mitali Schönenberger, Christian Karnatak, Paritosh |
| author_facet | Jha, Rounak Endres, Martin Watanabe, Kenji Taniguchi, Takashi Banerjee, Mitali Schönenberger, Christian Karnatak, Paritosh |
| contents | Twisted graphene based moiré heterostructures host a flat band at the magic angles where the kinetic energy of the charge carriers is quenched and interaction effects dominate. This results in emergent phases such as superconductors and correlated insulators that are electrostatically tunable. We investigate superconductivity in twisted trilayer graphene (TTG) by integrating it as the weak link in a superconducting quantum interference device (SQUID). The measured current phase relation (CPR) yields a large and tunable kinetic inductance, up to 150 nH per square, of the electron and hole type intrinsic superconductors. We further show that the specific kinetic inductance and the critical current density are universally related via the superconducting coherence length, and extract an upper bound of 200 nm for the coherence length. Our work opens avenues for using graphene-based superconductors as tunable elements in superconducting circuits. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_02320 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Large tunable kinetic inductance in a twisted graphene superconductor Jha, Rounak Endres, Martin Watanabe, Kenji Taniguchi, Takashi Banerjee, Mitali Schönenberger, Christian Karnatak, Paritosh Superconductivity Mesoscale and Nanoscale Physics Twisted graphene based moiré heterostructures host a flat band at the magic angles where the kinetic energy of the charge carriers is quenched and interaction effects dominate. This results in emergent phases such as superconductors and correlated insulators that are electrostatically tunable. We investigate superconductivity in twisted trilayer graphene (TTG) by integrating it as the weak link in a superconducting quantum interference device (SQUID). The measured current phase relation (CPR) yields a large and tunable kinetic inductance, up to 150 nH per square, of the electron and hole type intrinsic superconductors. We further show that the specific kinetic inductance and the critical current density are universally related via the superconducting coherence length, and extract an upper bound of 200 nm for the coherence length. Our work opens avenues for using graphene-based superconductors as tunable elements in superconducting circuits. |
| title | Large tunable kinetic inductance in a twisted graphene superconductor |
| topic | Superconductivity Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2403.02320 |