Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 29: Quantum Gases: Bosons IV

Q 29.1: Talk

Tuesday, March 7, 2017, 14:30–14:45, P 204

Non-equilibrium condensation of weakly interacting bosons in the presence of thermal baths: treating temperature-dependent dissipation — •Alexander Schnell and André Eckardt — Max-Planck-Institut für Physik komplexer Systeme, Dresden, Germany

When a quantum system is coupled weakly to a rapidly relaxing thermal bath of inverse temperature β, a simple description of this open system is given by the Born-Markov approximation. Within this framework, the bath induces quantum jumps between energy eigenstates, whose rates depend the bath temperature through the product βΔ E involving the energy change Δ E. Taking into account this form of temperature-dependent dissipation for a many-body system far from equilibrium is challenging. Already on the level of a simple mean-field approximation, it requires the diagonalization of the mean-field Hamiltonian in every step of the time integration. We propose and test a scheme to circumvent this problem by treating the system-bath coupling semi-classically and apply it to describe non-equilibrium Bose condensation in weakly interacting Bose gases in contact with two thermal baths of different temperature.