Dissipation in Open Two-Level Systems: Perturbation Theory and Polaron Transformation

TL;DR

This paper compares perturbation theory and polaron transformation methods for analyzing electron transport in two-level systems, highlighting their agreement in certain regimes relevant to recent quantum dot experiments.

Contribution

It provides a comparative analysis of two theoretical approaches for non-linear electron transport in two-level systems, emphasizing their applicability and agreement under specific conditions.

Findings

Good agreement between methods at weak coupling and large bias

Relevance to recent double quantum dot experiments

Clarifies the regimes where each approach is valid

Abstract

We compare standard perturbation theory with the polaron transformation for non-linear transport of electrons through a two-level system. For weak electron-phonon coupling and large bias, there is good agreement between both approaches. This regime has recently been explored in experiments in double quantum dots.