Theory of one-dimensional double-barrier quantum pump in two-frequency signal regime

TL;DR

This paper investigates a one-dimensional quantum pump with two oscillating barriers at frequencies ω and 2ω, analyzing how the alternating signals induce direct current in symmetric systems across various parameters.

Contribution

It introduces a theoretical model of a double-barrier quantum pump driven by two-frequency signals and explores its properties across different system parameters.

Findings

Direct current is generated even in symmetric systems.

The pump's behavior varies significantly with system parameters.

Theoretical insights into two-frequency driven quantum transport.

Abstract

A one-dimensional system with two $\delta$-like barriers or wells bi-chromaticaly oscillating at frequencies $\omega$ and $2\omega$ is considered. The alternating signal leads to the direct current across the structure (even in a symmetric system). The properties of this quantum pump are studied in a wide range of the system parameters.