Single- and few-electron dynamic quantum dots in a perpendicular magnetic field

TL;DR

This study investigates how magnetic fields influence electron transport in dynamic quantum dots, revealing increased confinement at low fields and disorder sensitivity at high fields, with implications for quantum current standards.

Contribution

The paper provides experimental insights into magnetic field effects on dynamic quantum dots, highlighting their potential for quantum current standards.

Findings

Increased electron confinement at low magnetic fields.

Device-dependent transport structures at high magnetic fields.

Implications for quantum standard of electrical current.

Abstract

We present experimental studies of the current pumped through a dynamic quantum dot over a wide range of magnetic fields. At low fields we observe repeatable structure indicating increased confinement of the electrons in the dynamic dot. At higher fields (B>3T), we observe structure which changes markedly from device to device suggesting that in this regime the transport is sensitive to local disorder. The results are significant for the development of dynamic quantum dot pumps as quantum standards of electrical current.