Charging effects in the ac conductance of a double barrier resonant tunneling structure

TL;DR

This paper presents a self-consistent calculation of ac conductance in double barrier resonant tunneling structures, emphasizing the importance of including time-dependent charge density effects in the well for accurate results.

Contribution

It introduces a self-consistent method to account for time-dependent charge density effects in ac conductance calculations of DBRTS, improving upon previous non-self-consistent approaches.

Findings

Including charge density effects significantly alters ac conductance results.

Total ac current differs from the average of non-self-consistent conduction currents.

Self-consistent calculations provide more accurate descriptions of ac response.

Abstract

There have been many studies of the linear response ac conductance of a double barrier resonant tunneling structure (DBRTS). While these studies are important, they fail to self-consistently include the effect of time dependent charge density in the well. In this paper, we calculate the ac conductance by including the effect of time dependent charge density in the well in a self-consistent manner. The charge density in the well contributes to both the flow of displacement currents and the time dependent potential in the well. We find that including these effects can make a significant difference to the ac conductance and the total ac current is not equal to the average of non-selfconsitently calculated conduction currents in the two contacts, an often made assumption. This is illustrated by comparing the results obtained with and without the effect of the time dependent charge density included properly.