Quasi-Andreev reflection in inhomogeneous Luttinger liquids

Details Quasi-Andreev reflection in inhomogeneous Luttinger liquids Quasi-Andreev reflection in inhomogeneous Luttinger liquids

1997-11-07

arxiv.org/abs/cond-mat/9711070v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 2 figures (eps)

Scientific paper

10.1103/PhysRevB.57.9879

Reflection of charge excitations at the step in the interaction strength in a Luttinger liquid can be of the Andreev type, even if the interactions are purely repulsive. The region with stronger repulsion plays the role of a normal metal in a normal-metal /superconductor junction, whereas the region with weaker repulsion plays the role of a superconductor. It is shown that this quasi-Andreev reflection leads to a number of proximity-like effects, including the local enhancement (suppression) of superconducting fluctuations on the quasi-normal (quasi-superconducting) side of the step, significant modification of the local density of states, as well as others. The observable consequences of these proximity effects are analyzed for the case of single- and two-particle tunneling from a normal-metal or superconducting tip into an inhomogeneous Luttinger-liquid wire.

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