Non-Kondo many-body physics in a Majorana-based Kondo type system

TL;DR

This paper theoretically investigates a Majorana-based system revealing a unique many-body state and an intermediate fixed point, distinct from traditional Kondo physics, with potential experimental signatures.

Contribution

It introduces a new low-energy fixed point in a Majorana system, differing from standard Kondo models, and explores its experimental implications.

Findings

Existence of a Majorana-mediated many-body state.

Identification of an intermediate low-energy fixed point.

Potential experimental signatures of the fixed point.

Abstract

We carry out a theoretical analysis of a prototypical Majorana system, which demonstrates the existence of a Majorana-mediated many-body state and an associated intermediate low-energy fixed point. Starting from two Majorana bound states, hosted by a Coulomb-blockaded topological superconductor and each coupled to a separate lead, we derive an effective low-energy Hamiltonian, which displays a Kondo-like character. However, in contrast to the Kondo model which tends to a strong- or weak-coupling limit under renormalization, we show that this effective Hamiltonian scales to an intermediate fixed point, whose existence is contingent upon teleportation via the Majorana modes. We conclude by determining experimental signatures of this fixed point, as well as the exotic many-body state associated with it.