Anomalous Density of States of a Luttinger Liquid in Contact with a Superconductor

C. Winkelholz; Rosario Fazio; F. W. J. Hekking; Gerd Schön

doi:10.1103/PhysRevLett.77.3200

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Anomalous Density of States of a Luttinger Liquid in Contact with a Superconductor

C. Winkelholz, Rosario Fazio, F. W. J. Hekking, Gerd Schön

DOI 10.1103/PhysRevLett.77.3200 · Physical Review Letters

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Abstract

We study the frequency and space dependence of the local tunneling density of states (DOS) of a Luttinger liquid (LL) connected to a superconductor. This coupling strongly modifies the single-particle properties of the LL. It significantly enhances the DOS near the Fermi level, whereas this quantity vanishes as a power law for an isolated LL. The enhancement is due to the interplay between electron-electron interactions and multiple backscattering processes of low-energy electrons at the interface between the LL and the superconductor. This anomalous behavior extends over large distances from the interface and may be detected by coupling normal probes to the system.

Source-reported materials — not catalogue approval

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