Supersonic rotation of a superfluid: a long-lived dynamical ring

Yanliang Guo (1, 2) , Romain Dubessy (1, 2) , Mathieu de Goër de Herve (1, 2) , Avinash Kumar (2, 1) , Thomas Badr (1, 2) , Aurélien Perrin (1, 2) , Laurent Longchambon (2, 1) , Hélène Perrin (1, 2)

1 LPL - Laboratoire de Physique des Lasers
2 Condensat de Bose-Einstein

We present the experimental realization of a long-lived superfluid flow of a quantum gas rotating in an anharmonic potential, sustained by its own angular momentum. The gas is set into motion by rotating an elliptical deformation of the trap. An evaporation selective in angular momentum yields an acceleration of rotation until the density vanishes at the trap center, resulting in a dynamical ring with 350 hbar angular momentum per particle. The density profile of the ring corresponds to the one of a quasi two-dimensional superfluid, with a linear velocity reaching Mach 18 and a rotation lasting more than a minute.

Domaines: Gaz Quantiques [cond-mat.quant-gas]; Physique Atomique [physics.atom-ph]

Yanliang Guo, Romain Dubessy, Mathieu de Goër de Herve, Avinash Kumar, Thomas Badr, et al.. Supersonic rotation of a superfluid: a long-lived dynamical ring. Physical Review Letters, 2020, 124 (2), ⟨10.1103/PhysRevLett.124.025301⟩. ⟨hal-02169160v2⟩