A general approach to quantum dynamics using a variational master equation: Application to phonon-damped Rabi rotations in quantum dots

Dara P. S. McCutcheon*, Nikesh S. Dattani, Erik M. Gauger, Brendon W. Lovett, Ahsan Nazir

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

118 Citations (Scopus)

Abstract

We develop a versatile master equation approach to describe the nonequilibrium dynamics of a two-level system in contact with a bosonic environment, which allows for the exploration of a wide range of parameter regimes within a single formalism. As an experimentally relevant example, we apply this technique to the study of excitonic Rabi rotations in a driven quantum dot, and compare its predictions to the numerical Feynman integral approach. We find excellent agreement between the two methods across a generally difficult range of parameters. In particular, the variational master equation technique captures effects usually considered to be nonperturbative, such as multiphonon processes and bath-induced driving renormalization, and can give reliable results even in regimes in which previous master equation approaches fail.

Original languageEnglish
Article number081305
Number of pages4
JournalPhysical Review. B, Condensed matter and materials physics
Volume84
Issue number8
DOIs
Publication statusPublished - 25 Aug 2011

Keywords

  • COHERENT
  • SYSTEM
  • BATH

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