Suppression of Coulomb blockade peaks by electronic correlations in InAs nanowires

TL;DR

This study investigates electronic transport in disordered InAs nanowires, revealing strong electron correlations that suppress Coulomb blockade peaks, with conductance behavior consistent with a Luttinger liquid model.

Contribution

First experimental observation of Coulomb blockade suppression due to strong correlations in InAs nanowires with g~0.4.

Findings

Conductance peaks decrease with decreasing temperature.

Luttinger parameter g estimated around 0.4.

Strong correlations influence transport behavior.

Abstract

We performed electronic transport measurements on 1D InAs quantum wires. In sufficiently disordered wires, transport is dominated by Coulomb blockade, and the conductance can be well described by tunneling through a quantum dot embedded between two one-dimensional Luttinger liquid wires. In contrast to previous experiments in other material systems, in our system the conductance difference between peak to valley decreases with decreasing temperature for several consecutive peaks. This phenomenon is theoretically expected to occur only for strongly interacting systems with small Luttinger interaction parameter g < 1/2; we find for our InAs wires a value of g~0.4. Possible mechanisms leading to these strong correlations are discussed.