title: Population inversion of a driven two-level system in a structureless bath.
abstract: We derive a master equation for a driven double quantum dot damped by an unstructured phonon bath, and calculate the spectral density. We find that bath-mediated photon absorption is important at relatively strong driving, and may even dominate the dynamics, inducing population inversion of the double-dot system. This phenomenon is consistent with recent experimental observations.
authors.affiliation: DAMTP, University of Cambridge, UK. tms29@cam.ac.uk
authors.forename: T M
authors.initials: TM
authors.lastname: Stace
authors.forename: A C
authors.initials: AC
authors.lastname: Doherty
authors.forename: S D
authors.initials: SD
authors.lastname: Barrett