Dynamical Localization and Absolute Negative Conductance in an ac driven double quantum well

TL;DR

This paper investigates the effects of THz radiation on double quantum wells, revealing phenomena like dynamical localization and negative conductance through a microscopic model that accounts for Coulomb interactions.

Contribution

It introduces a self-consistent microscopic model for the I-V characteristics of driven double quantum wells, highlighting the dependence on ac field parameters and charge states.

Findings

Observation of dynamical localization at specific ac parameters

Detection of absolute negative conductance in linear response

Agreement with recent experimental results

Abstract

We analyze the I-V characteristic of a double quantum well integrated in an antenna and driven by THz radiation.We propose a microscopic model to calculate the sequential current including selfconsistently the Coulomb interaction in a mean field approximation.Additional features in the current appear which depend not only on the frequency and intensity of the ac field but also on the charge in the wells.We observe,for some intensities and frequencies of the ac field,dynamical localization, i.e., quenching of the transmission,and, in the linear response regime, absolute negative conductance.We compare our calculations with recent experiments in driven double wells.