Mainz 2017 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 30: Ultracold atoms and BEC - III (with A)

Q 30.6: Vortrag

Dienstag, 7. März 2017, 15:45–16:00, N 1

angular self-localization of impurities rotating in a bosonic bath — •xiang li, mikhail Lemeshko, and robert seiringer — Institute of Science and Technology Austria, Am Campus 1, Klosterneuburg, Austria

The existence of a self-localization transition in the polaron problem has been under an active debate ever since Landau suggested it in 1933. Here we reveal the self-localization transition for the rotational analogue of the polaron - the angulon quasiparticle. The transition takes place at finite coupling strength already at the mean-field level, it is accompanied by a discontinuity in the first derivative of the angulon ground-state energy and a spherical-symmetry breaking of the angulon ground state. This symmetry breaking is demonstrated to be depend on the symmetry of the microscopic impurity-atom potential, which results in a number of distinct self-localized states. The predicted effects can potentially be addressed in experiments on cold molecules trapped in superfluid helium droplets and ultracold quantum gases, as well as on electronic excitations in solids and Bose-Einstein condensates.

[1] X. Li, R. Seiringer, M. Lemeshko, arXiv: 1610.04908