Superfluid drag of two-species Bose-Einstein condensates in optical lattices

Abstract

We study two-species Bose-Einstein condensates in quasi two-dimensional optical lattices of varying geometry and potential depth. Based on the numerically exact Bloch and Wannier functions obtained using the plane-wave expansion method, we quantify the drag (entrainment coupling) between the condensate components. This drag originates from the (short range) inter-species interaction and increases with the kinetic energy. As a result of the interplay between interaction and kinetic energy effects, the superfluid-drag coefficient shows a non-monotonic dependence on the lattice depth. To make contact with future experiments, we quantitatively investigate the drag for mass ratios corresponding to relevant atomic species.

6 pages, 4 figures. Accepted in its original form but minor changes have been done

References in corpus (14)

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• Unconventional interaction between vortices in a polarized Fermi gas

Cited by in corpus (14)

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• Coupled superfluidity of binary Bose mixtures in two dimensions
• Dynamical generation of chiral $W$ and Greenberger-Horne-Zeilinger states in laser-controlled Rydberg-atom trimers
• Borromean supercounterfluidity
• Coherent Atom Transport via Enhanced Shortcuts to Adiabaticity: Double-Well Optical Lattice
• Spin drag and fast response in a quantum mixture of atomic gases
• Dissipationless Vector Drag--Superfluid Spin Hall Effect
• Twist-and-turn dynamics of spin squeezing in bosonic Josephson junctions: Enhanced shortcuts-to-adiabaticity approach
• Detecting Entrainment in Fermi-Bose Mixtures
• Generation of entanglement and non-stationary states via competing coherent and incoherent bosonic hopping
• Signature of Andreev-Bashkin superfluid drag from Cavity Optomechanics
• Digital Quantum Simulation of Scalar Yukawa Coupling
• Drag-induced dynamical formation of dark solitons in Bose mixture on a ring
• Single-atom transport in optical conveyor belts: Enhanced shortcuts-to-adiabaticity approach