Constructive role of non-adiabaticity for quantized charge pumping

TL;DR

This paper experimentally explores how non-adiabaticity can both positively and negatively influence quantized charge pumping in a nanowire device, highlighting its essential role in single-parameter schemes.

Contribution

It provides experimental evidence for the constructive role of non-adiabaticity in single-parameter charge pumping, clarifying its impact across different frequencies.

Findings

Non-adiabaticity is essential for single-parameter charge pumping.

Non-adiabatic effects can enhance or suppress pumping current.

Experimental analysis over a broad frequency range confirms theoretical predictions.

Abstract

We investigate a recently developed scheme for quantized charge pumping based on single-parameter modulation. The device was realized in an AlGaAl-GaAs gated nanowire. It has been shown theoretically that non-adiabaticity is fundamentally required to realize single-parameter pumping, while in previous multi-parameter pumping schemes it caused unwanted and less controllable currents. In this paper we demonstrate experimentally the constructive and destructive role of non-adiabaticity by analysing the pumping current over a broad frequency range.