7 - 21.12.21 Hélène Perrin - Superfluid dynamics in a bubble/ClipID:38708 previous clip next clip

Recording date 2021-12-21

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Passwort

Language

English

Organisational Unit

Sonderforschungsbereich/Transregio 306/1: Quantenkooperativität von Licht und Materie - QuCoLiMa

Producer

Sonderforschungsbereich/Transregio 306/1: Quantenkooperativität von Licht und Materie - QuCoLiMa

Speaker:
Helene Perrin – Universite Sorbonne Paris Nord

Title:
Superfluid dynamics in a bubble

Abstract:
Quantum gases represent with a very convenient and widely tunable system for the study of superfluidity. In particular, they can be confined in a large variety of geometries (harmonic traps, optical lattices, box traps, lower dimensional traps…), enabling the study of superfluid dynamics with specific contraints. In my talk I will describe two recent experiments performed in the BEC group of Sorbonne Paris Nord University with a Bose quantum gas confined in a rotationally invariant shell trap, i.e. trapped at the surface of a “bubble”: the atoms can move freely in directions parallel to the surface and are strongly confined in the transverse direction. In the first experiment, the atoms initially at rest at the bottom of the shell – because of gravity – are set into fast rotation until the centrifugal force pushes them away from the bottom such that they form an annular cloud rotating at supersonic speeds. In the second experiment, we implement a way to compensate gravity on the shell. We evidence new effects that prevent the atoms to fill the entire shell, leading again to an annular density distribution but this time in equilibrium.

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QuCoLiMaTalks are the weekly seminar of the collaborative research center TRR 306 QuCoLiMa (Quantum Cooperativity of Light and Matter).
The talks are given by (external) experts, whose research falls within the scope of QuCoLiMa.

More information at www.qucolima.de/talks

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