Thermal conductance and nonequilibrium superconductivity in a diffusive NSN wire probed by shot noise
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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10
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Physical Review B, Volume 104, issue 12
Abstract
We investigate diffusive nanowire-based structures with two normal terminals on the sides and a central superconducting island in the middle, which is either grounded or floating. Using a semiclassical calculation we demonstrate that both device layouts permit a quantitative measurement of the energy dependent subgap thermal conductance Gth from the spectral density of the current noise. In the floating case this goal is achieved without the need to contact the superconductor provided the device is asymmetric, which may be attractive from the experimental point of view. In addition, we observe that the shot noise in the floating case is sensitive to a well-known effect of nonequilibrium suppression and bistability of the superconducting gap. Our calculations are directly applicable to the multimode case and can serve as a starting point to understand the shot noise response in an open one-dimensional Majorana device.Description
Funding Information: We thank A. O. Denisov, K. E. Nagaev, T. M. Klapwijk, and, particularly, E. S. Tikhonov for valuable discussions. We are grateful to Y. V. Fominov for the insights about the Usadel theory. This work was mainly supported by the Russian Science Foundation Project No. 19-12-00326. The calculation of the finite temperature shot noise expression in Appendix was performed under the state task of ISSP RAS. Publisher Copyright: © 2021 American Physical Society.
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Bubis, A V, Shpagina, E V, Nasibulin, A G & Khrapai, V S 2021, 'Thermal conductance and nonequilibrium superconductivity in a diffusive NSN wire probed by shot noise', Physical Review B, vol. 104, no. 12, 125409. https://doi.org/10.1103/PhysRevB.104.125409