Fluxon cotunneling in coupled Josephson junctions: Perturbation theory
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866916731443740672 |
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| author | Semenov, Andrew G. Latyshev, Alex Zaikin, Andrei D. |
| author_facet | Semenov, Andrew G. Latyshev, Alex Zaikin, Andrei D. |
| contents | We investigate the effects of fluxon cotunneling and quantum Coulomb drag in a system of two small Josephson junctions coupled by means of mutual capacitance $C_m$. Depending on the value of $C_m$ we identify three different regimes of strong, intermediate and weak coupling. Focusing our attention on the last two regimes we develop a perturbation theory in the interaction and explicitly derive fluxon cotunneling amplitudes at sufficiently small mutual capacitance values. We demonstrate that the Coulomb drag effect survives at any non-zero $C_m$ and evaluate the non-local voltage response that is in general determined by a trade off between two different cotunneling processes. Our predictions can be straightforwardly generalized to bilinear Josephson chains and directly verified in future experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_06720 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Fluxon cotunneling in coupled Josephson junctions: Perturbation theory Semenov, Andrew G. Latyshev, Alex Zaikin, Andrei D. Superconductivity We investigate the effects of fluxon cotunneling and quantum Coulomb drag in a system of two small Josephson junctions coupled by means of mutual capacitance $C_m$. Depending on the value of $C_m$ we identify three different regimes of strong, intermediate and weak coupling. Focusing our attention on the last two regimes we develop a perturbation theory in the interaction and explicitly derive fluxon cotunneling amplitudes at sufficiently small mutual capacitance values. We demonstrate that the Coulomb drag effect survives at any non-zero $C_m$ and evaluate the non-local voltage response that is in general determined by a trade off between two different cotunneling processes. Our predictions can be straightforwardly generalized to bilinear Josephson chains and directly verified in future experiments. |
| title | Fluxon cotunneling in coupled Josephson junctions: Perturbation theory |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2505.06720 |