Controlling phase separation of binary Bose-Einstein condensates via mixed-spin-channel Feshbach resonance

TL;DR

This paper demonstrates control over phase separation in a binary Bose-Einstein condensate by tuning the Feshbach resonance in specific hyperfine states of rubidium-87, enabling precise manipulation of quantum phase behavior.

Contribution

It provides experimental and numerical analysis of how mixed-spin-channel Feshbach resonance influences phase separation in binary BECs, a novel control method.

Findings

Phase separation occurs on the lower magnetic-field side of the resonance.

Overlap of components is observed on the higher magnetic-field side.

Feshbach resonance curve is derived from atomic cloud shape analysis.

Abstract

We investigate controlled phase separation of a binary Bose-Einstein condensate (BEC) in the proximity of mixed-spin-channel Feshbach resonance in the |F = 1, mF = +1> and |F = 2,mF = -1> states of 87Rb at a magnetic field of 9.10 G. Phase separation occurs on the lower magnetic-field side of the Feshbach resonance while the two components overlap on the higher magnetic-field side. The Feshbach resonance curve of the scattering length is obtained from the shape of the atomic cloud by comparison with the numerical analysis of coupled Gross-Pitaevskii equations.