Multi-mode transport through a quantum nanowire with two embedded dots

TL;DR

This paper studies how electrons conduct through a two-dimensional quantum wire with two embedded quantum dots, revealing complex nonadiabatic transport behaviors influenced by inter- and intra-dot interactions.

Contribution

It introduces a T-matrix approach to analyze conductance in a quantum wire with Gaussian-shaped quantum wells, highlighting nonadiabatic effects and electron distribution patterns.

Findings

Transport exhibits strong nonadiabatic character in broad wires

Intertwined inter- and intra-dot processes affect conductance

Nearfield probability distributions reveal electron transport mechanisms

Abstract

We investigate the conductance of a quantum wire with two embedded quantum dots using a T-matrix approach based on the Lippmann-Schwinger formalism. The quantum dots are represented by a quantum well with Gaussian shape and the wire is two-dimensional with parabolic confinement in the transverse direction. In a broad wire the transport can assume a strong nonadiabatic character and the conductance manifests effects caused by intertwined inter- and intra-dot processes that are identified by analysis of the ``nearfield'' probability distribution of the transported electrons.