Spin-dependent inelastic collisions in spin-2 Bose-Einstein condensates

TL;DR

This study investigates spin-dependent inelastic collisions in F=2 87Rb Bose-Einstein condensates through experiments and theoretical modeling, revealing how atom loss rates depend on spin states and providing fundamental loss coefficients.

Contribution

It provides the first comprehensive measurement of spin-dependent two-body inelastic loss coefficients in F=2 87Rb BECs, combining experimental data with numerical solutions of the Gross-Pitaevskii equations.

Findings

Atom loss rates depend on the spin states of colliding atoms.

Two fundamental loss coefficients for total spin 0 and 2 were measured.

Experimental results agree with numerical simulations including magnetic field gradients.

Abstract

We studied spin-dependent two-body inelastic collisions in F=2 87Rb Bose-Einstein condensates both experimentally and theoretically. The 87Rb condensates were confined in an optical trap and selectively prepared in various spin states in the F=2 manifold at a magnetic field of 3.0 G. Measured atom loss rates are found to depend on spin states of colliding atoms. We measured two fundamental loss coefficients for two-body inelastic collisions with the total spin of 0 and 2; the coefficients determine loss rates for all the spin pairs. The experimental results for mixtures of all the spin combinations are in good agreement with numerical solutions of the Gross-Pitaevskii equations that include the effect of a magnetic field gradient.