Tunneling effect of the spin-2 Bose condensate driven by external magnetic fields

TL;DR

This study investigates the tunneling effects in a spin-2 Bose condensate under external magnetic fields, revealing step and oscillation behaviors in population transfer and tunneling currents among different spin states.

Contribution

It provides new insights into the spin-dependent tunneling dynamics of spin-2 Bose condensates influenced by external magnetic fields.

Findings

Population transfer shows step structure under cosinusoidal magnetic fields.

Tunneling currents among certain spin states exhibit periodic or irregular oscillations.

Distinct behaviors are observed between different spin state pairs.

Abstract

In this paper, we have studied tunneling effect of the spin-2 Bose condensate driven by external magnetic field. We find that the population transfers among spin-0 and spin-$\pm1$, spin-0 and spin-$\pm2$ exhibit the step structure under the external cosinusoidal magnetic field respectively, but there do not exist step structure among spin-$\pm1$ and spin-$\pm2$. The tunneling current among spin-$\pm1$ and spin-$\pm2$ may exhibit periodically oscillation behavior, but among spin-0 and spin-$\pm1$, spin-0 and spin-$\pm2$, the tunneling currents exhibit irregular oscillation behavior.