Conditional Spontaneous Spin Polarization and Bifurcation Delay in Coupled Two-Component Bose-Einstein Condensates

TL;DR

This paper investigates how bifurcations and spontaneous spin polarization in coupled two-component Bose-Einstein condensates depend on system parameters and phase, revealing hysteresis and metastability effects during parameter sweeps.

Contribution

It demonstrates the dependence of bifurcation and spin polarization on phase and parameters, and identifies bifurcation delay and hysteresis phenomena in the system.

Findings

Bifurcation and spin polarization depend on system parameters and relative phase.

Bifurcation delay causes metastability and hysteresis.

Hysteresis loop area increases with parameter sweep rate.

Abstract

The spontaneous spin polarization and bifurcation delay in two-component Bose-Einstein condensates coupled with Raman pulses are investigated. We find that the bifurcation and the spontaneous spin polarization depend not only on the system parameters, but also on the relative phase between two components. Through bifurcations, the system enters into the spontaneous spin polarization regime from the Rabi regime. We also find that bifurcation delay appears when the parameter is swept through the static bifurcation point. This bifurcation delay is responsible for metastability leading to hysteresis. The area enclosed in the hysteresis loop increases with the sweeping rate of the parameter.