Suppression of Nonequilibrium Quasiparticle Transport in Flat-Band Superconductors

Ville A.J. Pyykkönen; Sebastiano Peotta; Päivi Törmä

doi:10.1103/PhysRevLett.130.216003

Suppression of Nonequilibrium Quasiparticle Transport in Flat-Band Superconductors

Ville A.J. Pyykkönen, Sebastiano Peotta, Päivi Törmä

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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.

Original language	English
Article number	216003
Pages (from-to)	1-7
Number of pages	7
Journal	Physical Review Letters
Volume	130
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevLett.130.216003
Publication status	Published - 26 May 2023
MoE publication type	A1 Journal article-refereed

Keywords

Condensed Matter - Superconductivity
Condensed Matter - Mesoscale and Nanoscale Physics
Condensed Matter - Quantum Gases

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10.1103/PhysRevLett.130.216003

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title = "Suppression of Nonequilibrium Quasiparticle Transport in Flat-Band Superconductors",

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.",

keywords = "Condensed Matter - Superconductivity, Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Quantum Gases",

author = "Pyykk{\"o}nen, {Ville A.J.} and Sebastiano Peotta and P{\"a}ivi T{\"o}rm{\"a}",

note = "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: {\textcopyright} 2023 American Physical Society.",

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N2 - 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.

AB - 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.

KW - Condensed Matter - Superconductivity

KW - Condensed Matter - Mesoscale and Nanoscale Physics

KW - Condensed Matter - Quantum Gases

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Suppression of Nonequilibrium Quasiparticle Transport in Flat-Band Superconductors

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Correlations in multiband quantum systems

Flat bands and disorder: Flat bands and disorder

Peotta Sebastiano AT-kulut

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