Condensate depletion in two-species Bose gases: A variational Quantum Monte Carlo study

Abstract

We investigate two-species Bose gases in traps with various interactions using variational Quantum Monte Carlo (VMC) techniques at zero temperature. The bosons are represented by hard spheres (HS) whose diameter is equivalent to the s-wave scattering length in the low-energy and long-wavelength approximation. We explore the role of repulsive and attractive inter- or intraspecies interactions on the condensate properties of the mixtures, particularly the condensate fraction of each species as compared to the case when each species is in a separate trap of its own. We model the repulsive interactions by a hard core (HC) potential and the attractive interactions by a shallow model potential. The VMC density profiles and energies are evaluated at various interactions and two mass ratios of the species.

20 pages, 18 figures

References in corpus (2)

• Stability analysis for $n$-component Bose-Einstein condensate
• The evolution of additional (hidden) quantum variables in the interference of Bose-Einstein condensates

Cited by in corpus (12)

• Quantum de-mixing in binary mixtures of dipolar bosons
• Solvable Model of a Mixture of Bose-Einstein Condensates
• Solvable Model of a Generic Trapped Mixture of Interacting Bosons: Reduced Density Matrices and Proof of Bose-Einstein Condensation
• Solvable model of a generic driven mixture of trapped Bose-Einstein condensates and properties of a many-boson Floquet state at the limit of an infinite number of particles
• Demixing in symmetric supersolid mixtures
• Effects Beyond Center-of-Mass Separability in a Trapped Bosonic Mixture: Exact Results
• Coupled-cluster theory for trapped bosonic mixtures
• Fragmentation of a trapped bosonic mixture
• Fragmentation of a trapped multiple-species bosonic mixture
• Global and local condensate and superfluid fraction of a few hard core bosons in a cubic optical lattice plus external harmonic confinement
• Tunneling of a few strongly repulsive hard-sphere bosons in an optical lattice with tight external harmonic confinement: A quantum Monte Carlo investigation in continuous space
• Fragmentation of identical and distinguishable bosons' pairs and natural geminals of a trapped bosonic mixture