Non-Fermi liquid manifold in a Majorana device

TL;DR

This paper introduces a device setup with Majorana bound states that exhibits a stable manifold of non-Fermi liquid states, characterized by unique conductance scaling due to complex quantum processes.

Contribution

It proposes a novel Majorana device configuration that realizes a manifold of non-Fermi liquid states with tunable properties and analyzes the interplay of Kondo and Andreev processes.

Findings

Identification of a stable non-Fermi liquid manifold.

Continuous variation of scaling dimensions within the manifold.

Power-law temperature dependence of conductance.

Abstract

We propose and study a setup realizing a stable manifold of non-Fermi liquid states. The device consists of a mesoscopic superconducting island hosting $N \ge 3$ Majorana bound states tunnel-coupled to normal leads, with a Josephson contact to a bulk superconductor. We find a nontrivial interplay between multi-channel Kondo and resonant Andreev reflection processes, which results in the fixed point manifold. The scaling dimension of the leading irrelevant perturbation changes continuously within the manifold and determines the power-law scaling of the temperature dependent conductance.