Superconducting junctions with flat bands

P. Virtanen; R. P. S. Penttilä; P. Törmä; A. Díez-Carlón; D. K. Efetov; T. T. Heikkilä

doi:10.1103/7f1y-kjyl

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Superconducting junctions with flat bands

P. Virtanen, R. P. S. Penttilä, P. Törmä, A. Díez-Carlón, D. K. Efetov, T. T. Heikkilä

DOI 10.1103/7f1y-kjyl · Physical Review B

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Abstract

We analyze the properties of flat-band superconductor junctions that behave differently from ordinary junctions containing only metals with Fermi surfaces. In particular, we show how in the tunneling limit the critical Josephson current between flat-band superconductors is inversely proportional to the pair potential, how the quantum geometric contribution to the supercurrent appears even in the normal state of a flat-band weak link, and how Andreev reflection is strongly affected by the presence of bound states. Our results are relevant for analyzing the superconducting properties of junctions involving electronic systems with flat bands.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La3Ni2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown