Demonstration of nonlocal Josephson effect in Andreev molecules
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arXiv
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| Format: | Preprint |
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2023
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| author | Haxell, D. Z. Coraiola, M. Hinderling, M. Kate, S. C. ten Sabonis, D. Svetogorov, A. E. Belzig, W. Cheah, E. Krizek, F. Schott, R. Wegscheider, W. Nichele, F. |
| author_facet | Haxell, D. Z. Coraiola, M. Hinderling, M. Kate, S. C. ten Sabonis, D. Svetogorov, A. E. Belzig, W. Cheah, E. Krizek, F. Schott, R. Wegscheider, W. Nichele, F. |
| contents | We perform switching current measurements of planar Josephson junctions (JJs) coupled by a common superconducting electrode, with independent control over the two superconducting phase differences. We observe an anomalous phase shift in the current--phase relation of a JJ as a function of gate voltage or phase difference in the second JJ. This demonstrates a nonlocal Josephson effect, and the implementation of a $φ_0$-junction which is tunable both electrostatically and magnetically. The anomalous phase shift was larger for shorter distances between the JJs and vanished for distances much longer than the superconducting coherence length. Results are consistent with the hybridization of ABSs, leading to the formation of an Andreev molecule. Our devices constitute a realization of a tunable superconducting phase source, and could enable new coupling schemes for hybrid quantum devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_00866 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Demonstration of nonlocal Josephson effect in Andreev molecules Haxell, D. Z. Coraiola, M. Hinderling, M. Kate, S. C. ten Sabonis, D. Svetogorov, A. E. Belzig, W. Cheah, E. Krizek, F. Schott, R. Wegscheider, W. Nichele, F. Superconductivity Mesoscale and Nanoscale Physics We perform switching current measurements of planar Josephson junctions (JJs) coupled by a common superconducting electrode, with independent control over the two superconducting phase differences. We observe an anomalous phase shift in the current--phase relation of a JJ as a function of gate voltage or phase difference in the second JJ. This demonstrates a nonlocal Josephson effect, and the implementation of a $φ_0$-junction which is tunable both electrostatically and magnetically. The anomalous phase shift was larger for shorter distances between the JJs and vanished for distances much longer than the superconducting coherence length. Results are consistent with the hybridization of ABSs, leading to the formation of an Andreev molecule. Our devices constitute a realization of a tunable superconducting phase source, and could enable new coupling schemes for hybrid quantum devices. |
| title | Demonstration of nonlocal Josephson effect in Andreev molecules |
| topic | Superconductivity Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2306.00866 |