Shape oscillation of a rotating Bose-Einstein condensate

Sabine Stock (1) , Vincent Bretin (1) , Frédéric Chevy (1) , Jean Dalibard (1)

1 LKB (Lhomond) - Laboratoire Kastler Brossel

We present a theoretical and experimental analysis of thetransverse monopole mode of a fast rotating Bose-Einsteincondensate. The condensate's rotation frequency is similar to thetrapping frequency and the effective confinement is only ensuredby a weak quartic potential. We show that the non-harmoniccharacter of the potential has a clear influence on the modefrequency, thus making the monopole mode a precise tool for theinvestigation of the fast rotation regime.

Mots clés: Bose-Einstein condensate

Mots clés: vortex; breathing mode

Domaines: Autre [cond-mat.other]; Systèmes mésoscopiques et effet Hall quantique [cond-mat.mes-hall]

Sabine Stock, Vincent Bretin, Frédéric Chevy, Jean Dalibard. Shape oscillation of a rotating Bose-Einstein condensate. 2003. ⟨hal-00000817⟩