Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 35, Issue 12, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-648X/acb522
Keywords
superconductivity; quantum materials; Green's functions; nonequilibrium transport
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This paper proposes a formula for the two-particle transmission coefficient in Cooper-pair transport between multi-band normal and superconducting materials, providing a direct calculation of the two-particle current without the use of Andreev reflection. As an application, the paper demonstrates a low-field linear magnetoresistance effect for superconductors with an induced nonunitary order parameter. These findings offer a new approach to detect unconventional nonunitary superconductivity in quantum materials of current interest.
Many-body transport has emerged as an efficient tool for understanding interaction effects in quantum materials with a multi-band electronic structure. This paper proposes a formula for the two-particle transmission coefficient for Cooper-pair transport between multi-band normal and superconducting materials. The approach employs a tight-binding nonequilibrium Green's function technique, allowing a direct calculation of the two-particle current, without invoking the paradigm of Andreev reflection. As an application of the theory, we demonstrate a low-field linear magnetoresistance effect for superconductors with an induced nonunitary order parameter. These results uncover an unexplored route for detecting unconventional nonunitary superconductivity in quantum materials of current theoretical and experimental interest.
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