Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 9: Bosonic Quantum Gases II (joint session Q/A)

Q 9.2: Talk

Monday, March 11, 2024, 17:15–17:30, Aula

Bath engineering in atomic quantum gas mixtures — •Lorenz Wanckel, Alexander Schnell, and André Eckardt — Technische Universität Berlin, Institut für Theoretische Physik, 10623 Berlin, Germany

Open quantum many-body systems interacting with their environment can reach interesting non-equilibrium steady states. We want to describe a quantum gas mixture theoretically in the framework of open systems in order to use it for dissipative quantum simulations. We consider a mixture of ultracold atoms of two different species, treating one as the system and the other as the bath, both weakly interacting via contact interaction. The specific model system describes atoms trapped in a one-dimensional optical lattice which is immersed in the cloud of bath atoms. Due to species-selective potentials it is possible that the bath atoms are uneffected by the lattice potential and freely evolve and interact with the system atoms. The bath is treated as an ideal fermionic/bosonic quantum gas. Starting from a microscopic model, we define a spectral coupling density within the Born-Markov approximation scheme and compare it with a simple ansatz describing a local ohmic bath, which is often used in this scenario.

Keywords: Spectral density; Born-Markov