Tunable effective g-factor in InAs nanowire quantum dots

TL;DR

This study measures the Zeeman spin splitting in InAs nanowire quantum dots, revealing that the effective g-factor varies significantly with dot size, from bulk-like to much smaller values.

Contribution

It demonstrates tunable effective g-factors in InAs quantum dots, linking size to spin properties, and provides a simple model to explain the dependence.

Findings

g-factor varies from 13 to 2.3 depending on dot size

Zeeman splitting measurements reveal size-dependent spin properties

InAs nanowire quantum dots exhibit tunable spin characteristics

Abstract

We report tunneling spectroscopy measurements of the Zeeman spin splitting in InAs few-electron quantum dots. The dots are formed between two InP barriers in InAs nanowires with a wurtzite crystal structure grown by chemical beam epitaxy. The values of the electron g-factors of the first few electrons entering the dot are found to strongly depend on dot size and range from close to the InAs bulk value in large dots |g^*|=13 down to |g^*|=2.3 for the smallest dots. These findings are discussed in view of a simple model.