Observation of Spin Superfluidity in a Bose Gas Mixture
Year: 2018
Authors: Fava E., Bienaimé T., Mordini C., Colzi G., Qu C., Stringari S., Lamporesi G., Ferrari G.
Autors Affiliation: Univ Trento, INO, CNR, BEC Ctr, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy; Ist Nazl Fis Nucl, Trento Inst Fundamental Phys & Applicat, I-38123 Povo, Italy.
Abstract: The spin dynamics of a harmonically trapped Bose-Einstein condensed binary mixture of sodium atoms is experimentally investigated at finite temperature. In the collisional regime the motion of the thermal component is shown to be damped because of spin drag, while the two condensates exhibit a counterflow oscillation without friction, thereby providing direct evidence for spin superfluidity. Results are also reported in the collisionless regime where the spin components of both the condensate and thermal part oscillate without damping, their relative motion being driven by a mean-field effect. We also measure the static polarizability of the condensed and thermal parts and we find a large increase of the condensate polarizability with respect to the T=0 value, in agreement with the predictions of theory.
Journal/Review: PHYSICAL REVIEW LETTERS
Volume: 120 (17) Pages from: 170401-1 to: 170401-6
More Information: We thank L. Pitaevskii, A. Recati, C. Fort, F. Minardi, F. Gerbier, N. Proukakis, and E. Sonin for useful comments and discussions. We acknowledge funding by the Provincia Autonoma di Trento, EC-H2020 Grant QUIC No. 641122, and Istituto Nazionale di Fisica Nucleare under the FISH project.KeyWords: Collective Oscillations; Fermi Gas; DynamicsDOI: 10.1103/PhysRevLett.120.170401Citations: 47data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-09-29References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here