Mainz 2017 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 15: Ultracold atoms and BEC - III (with Q)
A 15.8: Vortrag
Dienstag, 7. März 2017, 16:15–16:30, N 1
Numerical Simulation of a mobile Impurity in a BEC — •Tobias Lausch1, Fabian Grusdt3, Artur Widera1,2, and Michael Fleischhauer1 — 1TU Kaiserslautern and Forschungszentrum OPTIMAS, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany — 2Graduate School Materials Science in Mainz, Gottlieb-Daimler Strasse 47, 67663 Kaiserslautern, Germany — 3Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
Cooling atoms to ultracold temperatures, where quantum effects dominante, has become a standard approach in experimental quantum physics. An intriguing focus of research lies on impurity systems, aiming on elucidating microscopic properties of thermalization or quasi-particle formation in quantum systems. Recent experiments(1,2) shed light on the bose polaron and the interaction between impurities and a bose gas. We thoretically model the thermalization dynamics of a single impurity immersed into a BEC using Bogoliubov approximation. From the master equation, we derive the impurity’s momentum resolved scattering and numerically simulate the ensuing cooling dynamics. We find a separation of relaxation time scales originating from the superfluid nature of the condensate, indicating a prethermalized state. Furthermore we discuss the possibuility to exploit the emerging non-thermal impurity states to realize low-entropy quantum states by applying external forces.
(1) Hu et al. PRL 117(2016), 055301
(2) Jørgensen et al. PRL 117 (2016), 055302