Linear response study of collisionless spin drag
arXiv:2002.03955 · doi:10.1103/PhysRevResearch.3.023196
Abstract
In this work we are concerned with the understanding of the collisionless drag or entrainment between two superfluids, also called Andreev-Bashkin effect, in terms of current response functions. The drag density is shown to be proportional to the cross transverse current-current response function, playing the role of a normal component for the single species superfluid density. We can in this way link the existence of finite entrainment with the exhaustion of the energy-weighted sum rule in the spin channel. The formalism is then used to reproduce some known results for a weakly interacting Bose-Bose mixture. Finally we include the drag effect to determine the beyond mean-field correction on the speed of sound and on the spin dipole excitations for a homogeneous and trapped gas, respectively.
12 pages, 3 figures
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- Hydrodynamics of multi-component Bosonic systems
- Spin conductivity spectrum and spin superfluidity in a binary Bose mixture
- Superfluid drag between excitonic polaritons and superconducting electron gas
- Signature of Andreev-Bashkin superfluid drag from Cavity Optomechanics
- Berezinskii-Kosterlitz-Thouless transitions in a ferromagnetic superfluid: effects of axial magnetization
- Superconductor-polariton non-dissipative drag in optical microcavity
- Finite-frequency normal and superfluid drag effects in two-component atomic Bose-Einstein condensates