Josephson oscillations in binary mixtures of F=1 spinor BECs

TL;DR

This paper theoretically investigates Josephson oscillations in a binary mixture of F=1 spinor Bose-Einstein condensates in a double-well potential, revealing complex dynamics and potential for measuring scattering lengths.

Contribution

It introduces a two-mode model to describe Josephson oscillations in spinor BEC mixtures, highlighting anti-Josephson behavior and population-dependent effects.

Findings

Less populated component shows anti-Josephson oscillations.

Oscillation behavior depends on spin collision channels.

Numerical results agree with analytical two-mode model.

Abstract

We analyze theoretically Josephson oscillations in a mixture of two Zeeman states of a spinor Bose-Einstein condensate in a double-well potential. We find that in the strongly polarized case, the less populated component exhibits a complex dynamics with an anti-Josephson behavior, i.e. oscillates in phase with the more populated one. In the balanced population case the Josephson oscillations unveal a dependence with the different spin collision channels. This effect could be used to experimentally measure the distinct scattering lengths entering in the description of a spinor condensate. Our numerical results are in close agreement with an analytical description of the binary mixture using a two mode model.