Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 38: Poster: Quantum Optics and Photonics I

Q 38.12: Poster

Tuesday, March 6, 2018, 16:15–18:15, Orangerie

Weakly interacting Bose gases far from thermal equilibrium — •Lingna Wu, André Eckardt, and Alexander Schnell — Max Planck Institut für Physik komplexer Systeme

For the ideal gas 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. Taking into account temperature-dependent dissipation for the interacting gas 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. This allows for simulating true non-equilibrium steady states, for example by coupling the system to two baths with different temperature T. We treat both systems with particle number conservation and systems with particle pump and loss. In the latter case we apply our model to find predictions for exciton polariton experiments.