Geometrical Asymmetry Effect on Energy and Momentum Transfer Rates in a Double-quantum-well Structure: Linear Regime

TL;DR

This paper theoretically examines how spatial asymmetry influences energy and momentum transfer rates in a double-quantum-well system within the linear regime, highlighting the role of plasmon modes and temperature effects.

Contribution

It introduces a detailed theoretical analysis of asymmetry effects on transfer rates using the balance equation approach and approximations for different electron densities.

Findings

Asymmetry significantly alters energy and drag rates due to plasmon mode changes.

The asymmetry effect diminishes at lower temperatures when short-range interactions are included.

Screened potential calculations depend on high or low electron densities.

Abstract

We investigate theoretically the effect of spatial asymmetry on the energy and momentum transfer rates in a double-quantum-well system using balance equation approach. Our study is limited to the linear regime where the applied electric field is sufficiently weak. We calculate the screened potential by using the random phase approximation and Hubbard approximation for the cases of high and low electron densities, respectively. Our numerical results predict that the spatial asymmetry affects considerably both the energy transfer and drag rates as a result of changes in plasmon modes. Also, we find that the spatial asymmetry effect disappears at lower temperatures by inclusion the short-range interaction.