Erlangen 2022 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 8: Quantum Gases (Bosons) II

Q 8.2: Vortrag

Montag, 14. März 2022, 16:45–17:00, Q-H10

Driving a 1D Bose Gas into Non-Equilibrium by Particle Losses — Anja Seegebrecht and •Carsten Henkel — Universität Potsdam, Institut für Physik und Astronomie

Low-dimensional Bose gases form a model system where comparison to a portfolio of theories (Lieb-Liniger, Luttinger liquid, stochastic Gross-Pitaevskii equation [1]) is possible. Being a nearly integrable system, long-lived non-equilibrium states appear while particles are lost [2]. We perform stochastic simulations for loss processes also involving 2-, or 3-body collisions. The thermometers we developed give different readings as the system evolves, that can be given heuristic interpretations and compared to experiments. Particular large discrepancies appear due to the “shot noise” that arises from the information gain due to particle loss [3].

[1] N. Proukakis, S. Gardiner, M. Davis, and M. Szymańska, Quantum Gases: Finite Temperature and Non-Equilibrium Dynamics, Series Cold Atoms vol. 1 (Imperial College Press 2013).

[2] A. Johnson, S. Szigeti, M. Schemmer, and I. Bouchoule, “ Long-lived non-thermal states realized by atom losses in one-dimensional quasi-condensates,” Phys. Rev. A 96 (2017) 013623.

[3] P. Grišins, B. Rauer, T. Langen, J. Schmiedmayer, and I. E. Mazets, “Degenerate Bose gases with uniform loss,” Phys. Rev. A 93 (2016) 033634; I. Bouchoule, M. Schemmer, and C. Henkel, “Cooling phonon modes of a Bose condensate with uniform few body losses,” SciPost Phys. 5 (2018) 043.