Dynamics of spin-2 Bose condensate driven by external magnetic fields

TL;DR

This paper investigates the dynamic behavior of F=2 spinor Bose-Einstein condensates under external magnetic fields, revealing conditions for population localization and analyzing effects of noise and interactions.

Contribution

It provides a general formula for oscillation periods and explores the robustness of spin localization phenomena against noise and nonlinear interactions.

Findings

Population transfer can be controlled by magnetic field parameters.

Dynamic spin localization occurs under specific frequency-amplitude relations.

Coherent phenomena are robust against nonlinear interactions despite external noise.

Abstract

Dynamic response of the F=2 spinor Bose-Einstein condensate (BEC) under the influence of external magnetic fields is studied. A general formula is given for the oscillation period to describe population transfer from the initial polar state to other spin states. We show that when the frequency and the reduced amplitude of the longitudinal magnetic field are related in a specific manner, the population of the initial spin-0 state will be dynamically localized during time evolution. The effects of external noise and nonlinear spin exchange interaction on the dynamics of the spinor BEC are studied. We show that while the external noise may eventually destroy the Rabi oscillations and dynamic spin localization, these coherent phenomena are robust against the nonlinear atomic interaction.