17,036 research outputs found
Elastic Multi-Body Interactions on a Lattice
We show that by coupling two hyperfine states of an atom in an optical
lattice one can independently control two-, three-, and four-body on-site
interactions in a non-perturbative manner. In particular, under typical
conditions of current experiments one can have a purely three- or four-body
interacting gas of K atoms characterized by on-site interaction shifts
of several 100Hz.Comment: 6 pages, 3 figure
Three-Body Interacting Bosons in Free Space
We propose a method of controlling two- and three-body interactions in an
ultracold Bose gas in any dimension. The method requires us to have two coupled
internal single-particle states split in energy such that the upper state is
occupied virtually but amply during collisions. By varying system parameters
one can switch off the two-body interaction while maintaining a strong
three-body one. The mechanism can be implemented for dipolar bosons in the
bilayer configuration with tunnelling or in an atomic system by using
radio-frequency fields to couple two hyperfine states. One can then aim to
observe a purely three-body-interacting gas, dilute self-trapped droplets, the
paired superfluid phase, Pfaffian state, and other exotic phenomena.Comment: Published version with Supplemental Materia
Ultradilute low-dimensional liquids
We calculate the energy of one- and two-dimensional weakly interacting
Bose-Bose mixtures analytically in the Bogoliubov approximation and by using
the diffusion Monte Carlo technique. We show that in the case of attractive
inter- and repulsive intraspecies interactions the energy per particle has a
minimum at a finite density corresponding to a liquid state. We derive the
Gross-Pitaevskii equation to describe droplets of such liquids and solve it
analytically in the one-dimensional case.Comment: published version + supplemental materia
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