Contact parameters in two dimensions for general three-body systems

Abstract

We study the two dimensional three-body problem in the general case of three distinguishable particles interacting through zero-range potentials. The Faddeev decomposition is used to write the momentum-space wave function. We show that the large-momentum asymptotic spectator function has the same functional form as derived previously for three identical particles. We derive analytic relations between the three different Faddeev components for three distinguishable particles. We investigate the one-body momentum distributions both analytically and numerically and analyze the tail of the distributions to obtain two- and three-body contact parameters. We specialize from the general cases to examples of two identical, interacting or non-interacting, particles. We find that the two-body contact parameter is not a universal constant in the general case and show that the universality is recovered when a subsystem is composed of two identical non-interacting particles. We also show that the three-body contact parameter is negligible in the case of one non-interacting subsystem compared to the situation where all subsystem are bound. As example, we present results for mixtures of Lithium with two Cesium or two Potassium atoms, which are systems of current experimental interest.

24 pages, 7 figures, published version

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Cited by in corpus (4)

• Few-body correlations in two-dimensional Bose and Fermi ultracold mixtures
• Dynamical excitation processes and correlations of three-body two-dimensional mixtures
• Single particle momentum distributions for three-bosons in two and three dimensions and dimensional crossover
• Exact ground state for the four-electron problem in a 2D finite honeycomb lattice