Finite-frequency normal and superfluid drag effects in two-component atomic Bose-Einstein condensates

Abstract

Two-component systems consisting of mutually interacting particles can demonstrate both intracomponent transport effects and intercomponent entrainment (or drag) effects. In the presence of superfluidity, the intracomponent transport is characterized by dissipative conductivity and superfluid weight in the framework of two-fluid model, and intercomponent entrainment gives rise to normal and nondissipative drag effects. We present unified treatment of all these effects for spatially homogeneous two-component atomic Bose-Einstein condensates based on the Bogoliubov theory, focusing specifically on the drag effects. Calculating finite-frequency intra- and intercomponent conductivities with taking into account quasiparticle damping, we derive and numerically check analytical Drude-like approximations applicable at low frequencies, and Lorentz-like approximations applicable at higher frequencies in vicinity of the resonant energy of spin-to-density Bogoliubov quasiparticle conversion. As possible physical realizations of two-component atomic systems, we consider three-dimensional Bose-Bose mixtures and closely spaced two-layered systems of magnetic dipolar atoms.

14 pages, 7 figures; updated version with several additional discussions and references

References in corpus (16)

• Quantum liquid droplets in a mixture of Bose-Einstein condensates
• Quantum Gases in Optical Boxes
• Stability of quasi-two-dimensional Bose-Einstein condensates with dominant dipole-dipole interactions
• Few-body Bose gases in low dimensions -- a laboratory for quantum dynamics
• Bogoliubov Excitations of Disordered Bose-Einstein Condensates
• A two-dimensional quantum gas in a magnetic trap
• Study of the inter-species interactions in an ultracold dipolar mixture
• Thermography of the superfluid transition in a strongly interacting Fermi gas
• Multiple-q current states in a multicomponent superconducting channel
• Magneto-topological transitions in multicomponent superconductors
• Center motions of nonoverlapping condensates coupled by long-range dipolar interaction in bilayer and multilayer stacks
• Dynamics of a degenerate Cs-Yb mixture with attractive interspecies interactions
• Optical spin conductivity in ultracold quantum gases
• Spin conductivity spectrum and spin superfluidity in a binary Bose mixture
• Superfluid drag between excitonic polaritons and superconducting electron gas
• Superconductor-polariton non-dissipative drag in optical microcavity