Andreev reflection in normal metal/charge-4e superconductor junctions

Yi-Xin Dai; Qing-Feng Sun

doi:10.1103/PhysRevB.109.144504

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Andreev reflection in normal metal/charge-4e superconductor junctions

Yi-Xin Dai, Qing-Feng Sun

DOI 10.1103/PhysRevB.109.144504 · Physical Review B

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Abstract

We investigate the Andreev reflection in a normal metal/charge-4e superconductor junction. Compared with the electron-hole conversion in normal charge-2e superconductors, here four electrons participate simultaneously, enriching the possibility of conversion ways. Using the nonequilibrium Green's function method, we obtain a four-particle-type Landauer-Büttiker formula with generalized charge-4e anomalous Green's function to describe it. We then calculate and clarify the behavior of the Andreev coefficient and the conductance contributed by it, showing features like the unconventional position of the peak structure and the emerging plateau inside the superconducting gap. Our research makes up the blank of research for transport property of charge-4e superconductors and can serve as a hallmark for future experimental verifications.