6533b870fe1ef96bd12cf16e
RESEARCH PRODUCT
Quantum dissipative dynamics of a bistable system in the sub-Ohmic to super-Ohmic regime
Luca MagazzùAngelo CarolloBernardo SpagnoloBernardo SpagnoloDavide Valentisubject
Statistics and ProbabilityBistabilityQuantum dynamicsFOS: Physical sciencesquantum transport in one-dimension01 natural sciencesSettore FIS/03 - Fisica Della Materia010305 fluids & plasmas0103 physical sciencesMesoscale and Nanoscale Physics (cond-mat.mes-hall)Initial value problem010306 general physicsQuantumQuantum tunnellingquantum transportPhysicsdissipative systems (theory)Condensed matter physicsCondensed Matter - Mesoscale and Nanoscale PhysicsStatistical and Nonlinear PhysicsDissipationPath integral formulationRelaxation (physics)dissipative systems (theory); quantum transport; quantum transport in one-dimension; Statistical and Nonlinear Physics; Statistics and Probability; Statistics Probability and UncertaintyStatistics Probability and UncertaintyStatistical and Nonlinear Physicdescription
We investigate the quantum dynamics of a multilevel bistable system coupled to a bosonic heat bath beyond the perturbative regime. We consider different spectral densities of the bath, in the transition from sub-Ohmic to super-Ohmic dissipation, and different cutoff frequencies. The study is carried out by using the real-time path integral approach of the Feynman-Vernon influence functional. We find that, in the crossover dynamical regime characterized by damped \emph{intrawell} oscillations and incoherent tunneling, the short time behavior and the time scales of the relaxation starting from a nonequilibrium initial condition depend nontrivially on the spectral properties of the heat bath.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-01-01 |