Dynamical Zeeman resonance in spin-orbit-coupled spin-1 Bose gases

TL;DR

This paper predicts a dynamical resonance effect in spin-orbit-coupled spin-1 Bose-Einstein condensates driven by Zeeman fields, revealing peaks in oscillations and spin polarizations useful for quantum applications.

Contribution

It introduces the concept of Zeeman-driven dynamical resonance in spin-1 BECs and derives a simple algebraic condition for resonance, advancing understanding of spin-orbit-coupled quantum gases.

Findings

Resonant peaks in oscillations and spin polarizations at specific Zeeman field strengths

Resonance explained by out-of-phase interference of spin-orbit states

Algebraic relation linking linear and quadratic Zeeman fields for resonance

Abstract

We predict a dynamical resonant effect, which is driven by externally applied linear and quadratic Zeeman fields, in a spin-orbit-coupled spin-1 Bose-Einstein condensate. The Bose-Einstein condensate is assumed to be initialized in some superposed state of Zeeman sublevels and subject to a sudden shift of the trapping potential. It is shown that the time-averaged center-of-mass oscillation and the spin polarizations of the Bose-Einstein condensate exhibit remarkable resonant peaks when the Zeeman fields are tuned to certain strengths. The underlying physics behind this resonance can be traced back to the out-of-phase interference of the dynamical phases carried by different spinorbit states. By analyzing the single particle spectrum, the resonant condition is summarized as a simple algebraic relation, connecting the strengths of the linear and quadratic Zeeman fields. This property is potentially applicable in quantum information and quantum precision measurement.