# Isolating Majorana fermions with finite Kitaev nanowires and temperature: the universality of the zero-bias conductance

## TL;DR

This paper theoretically investigates how finite-size effects and temperature influence the zero-bias conductance peak associated with Majorana bound states in Kitaev nanowires, revealing universal conductance features useful for experimental identification.

## Contribution

It introduces a theoretical framework for understanding Majorana signatures in finite Kitaev nanowires at non-zero temperatures, highlighting universal conductance behavior during the crossover regimes.

## Key findings

- Overlapped Majorana modes can be decoupled at finite temperature.
- Universal conductance features emerge as a function of temperature.
- Leaked Majorana fermion fixed point can restore the zero-bias peak.

## Abstract

The zero-bias peak (ZBP) is understood as the definite signature of a Majorana bound state (MBS) when attached to a semi-infinite Kitaev nanowire (KNW) nearby zero temperature. However, such characteristics concerning the realization of the KNW constitute a profound experimental challenge. We explore theoretically a QD connected to a topological KNW of finite size at non-zero temperatures and show that overlapped MBSs of the wire edges can become effectively decoupled from each other and the characteristic ZBP can be fully recovered if one tunes the system into the leaked Majorana fermion fixed point. At very low temperatures, the MBSs become strongly coupled similarly to what happens in the Kondo effect. We derive universal features of the conductance as a function of the temperature and the relevant crossover temperatures. Our findings offer additional guides to identify signatures of MBSs in solid state setups.