Full-polaron master equation approach to dynamical steady states of a
driven two-level system beyond the weak system-environment coupling
- URL: http://arxiv.org/abs/2007.09122v1
- Date: Fri, 17 Jul 2020 17:21:01 GMT
- Title: Full-polaron master equation approach to dynamical steady states of a
driven two-level system beyond the weak system-environment coupling
- Authors: Chien-Chang Chen, Thomas M. Stace and Hsi-Sheng Goan
- Abstract summary: We apply a full-polaron master equation and a weak-coupling non-Markovian master equation to describe the steady-state properties of a driven two-level system.
Our full-polaron equation approach does not require the special renormalization scheme employed in their weak-coupling theoretical method.
- Score: 1.7188280334580193
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We apply a full-polaron master equation and a weak-coupling non-Markovian
master equation to describe the steady-state time-averaged properties of a
driven two-level system, an electron coherently tunneling between double
quantum dots (DQDs), interacting with a bosonic phonon bath. Comparing the
results obtained using these two master equations with those from a recent DQD
experiment and its corresponding weak-coupling theoretical method, we find that
the original parameter set used in the experiment and theoretical method is not
in the weak-coupling parameter regime. By using the full-polaron master
equation with a slight adjustment on only the value of the interdot separation
in the original experimental parameter set, we find that a reasonable fit to
the experimentally measured time-averaged steady-state population data can be
achieved. The adjusted interdot separation is within the possible values
allowed by the geometry of the surface gates that define the DQD in the
experiment. Our full-polaron equation approach does not require the special
renormalization scheme employed in their weak-coupling theoretical method, and
can still describe the experimental results of driving-induced phonon-enhanced
steplike shoulder behaviors in the experiment. This demonstrates that the
full-polaron master equation approach is a correct and efficient tool to
describe the steady-state properties of a driven spin-boson model in the case
of strong system-environment coupling.
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