Suppression of Nonequilibrium Quasiparticle Transport in Flat-Band Superconductors
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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7
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1-7
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Physical Review Letters, Volume 130, issue 21
Abstract
We study nonequilibrium transport through a superconducting flat-band lattice in a two-terminal setup with the Schwinger-Keldysh method. We find that quasiparticle transport is suppressed and coherent pair transport dominates. For superconducting leads, the ac supercurrent overcomes the dc current, which relies on multiple Andreev reflections. With normal-normal and normal-superconducting leads, the Andreev reflection and normal currents vanish. Flat-band superconductivity is, thus, promising not only for high critical temperatures, but also for suppressing unwanted quasiparticle processes.Description
Funding Information: P. T. and V. A. J. P. acknowledge support by the Academy of Finland under Projects No. 307419, No. 327293, and No. 349313. V. A. J. P. acknowledges financial support by the Jenny and Antti Wihuri Foundation. S. P. acknowledges support from the Academy of Finland under Grants No. 330384 and No. 336369. Publisher Copyright: © 2023 American Physical Society.
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Pyykkönen , V A J , Peotta , S & Törmä , P 2023 , ' Suppression of Nonequilibrium Quasiparticle Transport in Flat-Band Superconductors ' , Physical Review Letters , vol. 130 , no. 21 , 216003 , pp. 1-7 . https://doi.org/10.1103/PhysRevLett.130.216003