Observation of Massless and Massive Collective Excitations with Faraday Patterns in a Two-Component Superfluid
Authors: Cominotti R., Berti A., Farolfi A., Zenesini A., Lamporesi G., Carusotto I., Recati A., Ferrari G.
Autors Affiliation: INO-CNR BEC Center and Dipartimento di Fisica, Universita` di Trento, and
Trento Institute for Fundamental Physics and Applications, INFN, 38123 Povo, Italy
Abstract: We report on the experimental measurement of the dispersion relation of the density and spin collective excitation modes in an elongated two-component superfluid of ultracold bosonic atoms. Our parametric spectroscopic technique is based on the external modulation of the transverse confinement frequency, leading to the formation of density and spin Faraday waves. We show that the application of a coherent coupling between the two components reduces the phase symmetry and gives a finite mass to the spin modes.
Journal/Review: PHYSICAL REVIEW LETTERS
Volume: 128 Pages from: 210401-1 to: 210401-6
KeyWords: Faraday waves, superfluid mixture, excitation spectrumDOI: 10.1103/PhysRevLett.128.210401