I-V characteristics of SNS junctions with a multivalley normal region
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866918508194955264 |
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| author | Bonds, Liam Chiu, Shiang-Bin Andreev, Anton Spivak, Boris |
| author_facet | Bonds, Liam Chiu, Shiang-Bin Andreev, Anton Spivak, Boris |
| contents | In multivalley conductors the inter-valley relaxation time $τ_v$ and the inelastic relaxation time $τ_{in}$ may be significantly longer than the intra-valley momentum relaxation time $τ$. We show that this separation of time scales has dramatic effects on the I-V characteristics of SNS junctions with a multivalley normal region. We generalize the Larkin-Ovchinnikov equations describing superconducting kinetics to the case of multivalley superconductors. We use this generalization to obtain a kinetic description of multivalley SNS junctions. We find that at constant voltage bias $V$, the current $I(V)$ is nonmonotonic; it exhibits two peaks of similar magnitude $I_\text{max,1} \sim I_\text{max,2}$ at $V_1 \sim \hbar(eτ_{in})^{-1}$ and $V_2\sim \hbar(eτ_v)^{-1}$, which may greatly exceed the critical current $I_c(T)$. At constant current bias $I$ we find that in a wide interval, $I_c(T) < I \lesssim I_{\text{jump}}$, the nonlinear resistance of the junction is controlled by the long relaxation times and may be several orders of magnitude smaller than the normal state resistance. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_17667 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | I-V characteristics of SNS junctions with a multivalley normal region Bonds, Liam Chiu, Shiang-Bin Andreev, Anton Spivak, Boris Superconductivity Mesoscale and Nanoscale Physics In multivalley conductors the inter-valley relaxation time $τ_v$ and the inelastic relaxation time $τ_{in}$ may be significantly longer than the intra-valley momentum relaxation time $τ$. We show that this separation of time scales has dramatic effects on the I-V characteristics of SNS junctions with a multivalley normal region. We generalize the Larkin-Ovchinnikov equations describing superconducting kinetics to the case of multivalley superconductors. We use this generalization to obtain a kinetic description of multivalley SNS junctions. We find that at constant voltage bias $V$, the current $I(V)$ is nonmonotonic; it exhibits two peaks of similar magnitude $I_\text{max,1} \sim I_\text{max,2}$ at $V_1 \sim \hbar(eτ_{in})^{-1}$ and $V_2\sim \hbar(eτ_v)^{-1}$, which may greatly exceed the critical current $I_c(T)$. At constant current bias $I$ we find that in a wide interval, $I_c(T) < I \lesssim I_{\text{jump}}$, the nonlinear resistance of the junction is controlled by the long relaxation times and may be several orders of magnitude smaller than the normal state resistance. |
| title | I-V characteristics of SNS junctions with a multivalley normal region |
| topic | Superconductivity Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2605.17667 |