论文标题
具有自旋依赖性费米介导的相互作用的超速玻色混合物
Ultracold Bose Mixtures with Spin-Dependent Fermion-Mediated Interactions
论文作者
论文摘要
我们开发了一种与偏光费米子耦合的二元玻璃纤维凝结物的功能积分公式。我们发现依赖自旋的费米介导的相互作用对二元冷凝物的性质具有巨大的影响。准粒子频谱具有两个分支。高密度性质的上分支通过诱导的相互作用进行了修改，而旋转性质的下部分支是完整的。地面相图由可混杂的相位的稳定区域和向相分离的不稳定区域组成。在稳定的区域中，它通过上层分支的激发阻尼进一步分类。我们表明，可以通过调整相关参数（例如玻色子特性质量比，玻色子效率数密度比率和玻色子之间的种间相互作用）来找到明确的，长寿命的准粒子激发区域。由于有效的电位对二元冷凝物，我们探讨了量子波动的影响。事实证明，密度结构因子和旋转密度结构因子都达到了Feynman的关系，但后者不受费米介导的相互作用的影响。
We develop a functional integral formulation for binary Bose-Einstein condensates coupled to polarized fermions. We find that spin-dependent fermion-mediated interactions have dramatic effects on the properties of the binary condensates. The quasiparticle spectrum features two branches. The upper branch, which is of density nature, gets modified by the induced interactions, while the lower branch, which is of spin nature, is left intact. The ground-state phase diagram consists of stable region of miscible phases and unstable region toward phase separation. In the stable region, it is further classified by the damping of excitations of the upper branch. We show that it is possible to find region of well-defined, long-lived quasiparticle excitations by tuning relevant parameters, such as boson-fermion mass ratio, boson-fermion number density ratio, and interspecies interactions between bosons as well. We explore the effects of quantum fluctuation due to the effective potential on the binary condensates. It turns out that both the density structure factor and spin density structure factor fulfill the Feynman relation, except that the latter is immune to the fermion-mediated interactions.
