论文标题
在自旋轨道耦合的玻璃纤维中旋转挤压
Spin squeezing in a spin-orbit coupled Bose-Einstein condensate
论文作者
论文摘要
我们研究了带有拉曼诱导的自旋轨道偶联（SOC）的自旋1/2玻色子冷凝水（BEC）中的自旋挤压。在两光子共振和弱拉曼耦合强度的条件下，系统具有两个退化的接地状态，我们使用了有效的两模型模型。两种模型模型的哈密顿量采用了一轴搅拌的哈密顿量的形式，该形式众所周知会产生旋转挤压。更重要的是，我们表明SOC提供了方便的控制旋钮来调整负责旋转挤压的旋转非线性。具体而言，可以调节自旋非线性强度可与两体密度密度相互作用相媲美，因此，在常规的两个组件BEC系统（例如$^{87} $ rb和$^{23} $ NA中，在缺乏SOC的情况下，都比固有的自旋依赖性相互作用强度大得多。我们通过使用截短的Wigner方法进行完全均值的场外数值计算来确认自旋挤压。此外，还讨论了实验实施。
We study the spin squeezing in a spin-1/2 Bose-Einstein condensates (BEC) with Raman induced spin-orbit coupling (SOC). Under the condition of two-photon resonance and weak Raman coupling strength, the system possesses two degenerate ground states, using which we construct an effective two-mode model. The Hamiltonian of the two-mode model takes the form of the one-axis-twisting Hamiltonian which is known to generate spin squeezing. More importantly, we show that the SOC provides a convenient control knob to adjust the spin nonlinearity responsible for spin squeezing. Specifically, the spin nonlinearity strength can be tuned to be comparable to the two-body density-density interaction, hence is much larger than the intrinsic spin-dependent interaction strength in conventional two-component BEC systems such as $^{87}$Rb and $^{23}$Na in the absence of the SOC. We confirm the spin squeezing by carrying out a fully beyond-mean-field numerical calculation using the truncated Wigner method. Additionally, the experimental implementation is also discussed.
