Observation of Massless and Massive Collective Excitations with Faraday Patterns in a Two-Component Superfluid
Riccardo Cominotti, Anna Berti, A. Farolfi, Alessandro Zenesini, Giacomo Lamporesi, Iacopo Carusotto, Alessio Recati, G. Ferrari
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.
Topics & Concepts
PhysicsSuperfluidityMassless particleCondensed matter physicsExcitationDispersion relationSpin (aerodynamics)Component (thermodynamics)Faraday cageQuasiparticleSymmetry (geometry)Phase (matter)Quantum mechanicsMagnetic fieldSuperconductivityThermodynamicsMathematicsGeometryCold Atom Physics and Bose-Einstein CondensatesQuantum, superfluid, helium dynamicsAtomic and Subatomic Physics Research