Metal-Quantum Dot-Topological Superconductor Junction: Kondo correlations and Majorana Bound States

TL;DR

This paper investigates electron transport in a hybrid junction involving a normal metal, quantum dot, and topological superconductor, revealing the interplay of Kondo correlations and Majorana bound states affecting conductance behavior.

Contribution

It introduces a detailed analysis of how Majorana fermions influence Kondo physics in topological superconductor junctions, highlighting observable conductance features.

Findings

Conductance peak splits when Majorana coupling exceeds temperature

Conductance dips at zero temperature under certain conditions

Magnetic field reduces the height of conductance side-peaks

Abstract

Electron transport through [normal metal]-[quantum dot]-[topological superconductor] junction is studied and reveals interlacing physics of Kondo correlations with two Majorana fermions bound state residing on the opposite edges of the topological superconductor. When the strength of the Majorana fermion coupling exceeds the temperature $T$, this combination of Kono-Majorana fermion physics can be observed: The usual peak of the temperature dependent zero biased conductance $\sigma(V=0,T)$ splits and the conductance has a {\it dip} at T=0. The height of the conductance side-peaks decreases with magnetic field.