Binding between two-component bosons in one dimension

Abstract

We investigate the ground state of one-dimensional few-atom Bose-Bose mixtures under harmonic confinement throughout the crossover from weak to strong inter-species attraction. The calculations are based on the numerically exact multi-configurational time-dependent Hartree method. For repulsive components we detail the condition for the formation of a molecular Tonks-Girardeau gas in the regime of intermediate inter-species interactions, and the formation of a molecular condensate for stronger coupling. Beyond a critical inter-species attraction, the system collapses to an overall bound state. Different pathways emerge for unequal particle numbers and intra-species interactions. In particular, for mixtures with one attractive component, this species can be viewed as an effective potential dimple in the trap center for the other, repulsive component.

10 pages, 10 figures

References in corpus (14)

• Many-Body Physics with Ultracold Gases
• Instabilities in binary mixtures of one-dimensional quantum degenerate gases
• Few-boson dynamics in double wells: From single-atom to correlated-pair tunneling
• All-Optical Formation of Quantum Degenerate Mixtures
• Spin-charge separation in two-component Bose-gases
• Composite fermionization of 1-D Bose-Bose mixtures
• Correlations in Ultracold Trapped Few-Boson Systems: Transition from Condensation to Fermionization
• Mixture of bosonic and spin-polarized fermionic atoms in an optical lattice
• Pairing of 1D Bose-Fermi mixtures with unequal masses
• Excitations of Few-Boson Systems in 1-D Harmonic and Double Wells
• Ground-state properties of interacting two-component Bose gases in a one-dimensional harmonic trap
• Excitations of attractive 1-D bosons: Binding vs. fermionization
• Ground-state properties of interacting two-component Bose gases in a hard-wall trap
• The granularity of weakly occupied bosonic fields beyond the local density approximation