Bosonic transport through a chain of quantum dots

TL;DR

This paper investigates bosonic particle transport in a quantum dot chain coupled to reservoirs, deriving exact stochastic equations for non-interacting cases, analyzing steady states, and approximating interactions' effects.

Contribution

It provides an exact stochastic framework for non-interacting bosonic transport and explores the impact of interactions using semiclassical approximations.

Findings

Exact stochastic equations for non-interacting bosonic reservoirs

Analytical solution in the Markovian limit

Spectral analysis of steady-state particle flow

Abstract

The particle transport through a chain of quantum dots coupled to two bosonic reservoirs is studied. For the case of reservoirs of non-interacting bosonic particles, we derive an exact set of stochastic differential equations, whose memory kernels and driving noise are characterised entirely by the properties of the reservoirs. Going to the Markovian limit an analytically solvable case is presented. The effect of interparticle interactions on the transient behaviour of the system, when both reservoirs are instantaneously coupled to an empty chain of quantum dots, is approximated by a semiclassical method, known as the Truncated Wigner approximation. The steady-state particle flow through the chain and the mean particle occupations are explained via the spectral properties of the interacting system.