Gate-tunable Josephson diodes in magic-angle twisted bilayer graphene
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866916044064423936 |
|---|---|
| author | Rothstein, A. Dolleman, R. J. Klebl, L. Achtermann, A. Volmer, F. Watanabe, K. Taniguchi, T. Hassler, F. Banszerus, L. Beschoten, B. Stampfer, C. |
| author_facet | Rothstein, A. Dolleman, R. J. Klebl, L. Achtermann, A. Volmer, F. Watanabe, K. Taniguchi, T. Hassler, F. Banszerus, L. Beschoten, B. Stampfer, C. |
| contents | We report low-temperature measurements of two adjacent, gate-defined Josephson junctions (JJs) in magic-angle twisted bilayer graphene (MATBG) at a moiré filling factor near $ν= -2$. We show that both junctions exhibit a prominent, gate-tunable Josephson diode effect, which we explain by a combination of large kinetic inductance and non-uniform supercurrent distribution. Despite their proximity, the JJs display differences in their interference patterns and different diode behavior, underscoring that microscopic inhomogeneities such as twist angle variations shape the non-uniform supercurrent and drive the diode behavior. As a result, the nonreciprocal supercurrent can be tuned by gate voltage, enabling tuning of the diode efficiency and even reversing the polarity at fixed magnetic fields. Our findings offer potential routes for tailoring Josephson diode performance in superconducting quantum circuits. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_15503 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Gate-tunable Josephson diodes in magic-angle twisted bilayer graphene Rothstein, A. Dolleman, R. J. Klebl, L. Achtermann, A. Volmer, F. Watanabe, K. Taniguchi, T. Hassler, F. Banszerus, L. Beschoten, B. Stampfer, C. Mesoscale and Nanoscale Physics Materials Science We report low-temperature measurements of two adjacent, gate-defined Josephson junctions (JJs) in magic-angle twisted bilayer graphene (MATBG) at a moiré filling factor near $ν= -2$. We show that both junctions exhibit a prominent, gate-tunable Josephson diode effect, which we explain by a combination of large kinetic inductance and non-uniform supercurrent distribution. Despite their proximity, the JJs display differences in their interference patterns and different diode behavior, underscoring that microscopic inhomogeneities such as twist angle variations shape the non-uniform supercurrent and drive the diode behavior. As a result, the nonreciprocal supercurrent can be tuned by gate voltage, enabling tuning of the diode efficiency and even reversing the polarity at fixed magnetic fields. Our findings offer potential routes for tailoring Josephson diode performance in superconducting quantum circuits. |
| title | Gate-tunable Josephson diodes in magic-angle twisted bilayer graphene |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2510.15503 |