论文标题
驱动玻色子系统中相关性的超流量
Superfluidity from correlations in driven boson systems
论文作者
论文摘要
从理论上讲,我们研究了一个一维玻色子系统的超流量,该系统在零时间平均水平上定期调节跳动能量,从而导致抑制一阶单粒子跳跃过程。这种平面系统的动力学完全由相关性驱动,并由异国情调的哈密顿和当前运营商描述。我们采用了确切的对角度化,并将我们的结果与常规的,未发达的Bose-Hubbard系统的结果进行比较。我们专注于超流体的两种主要表现,赫斯 - 养育银行效应和超电流的亚竞争力,并在相关时明确包含杂质。在新型的超流体特征中,我们强调了类似猫的基态的存在,其分支具有相反的晶体动量,但具有相同的磁通依赖性电流,以及地面波浪函数集体组件之间干扰的基本作用。动态外形的计算揭示了声学模式的存在,可确保热力学极限中的超流量。
We investigate theoretically the superfluidity of a one-dimensional boson system whose hopping energy is periodically modulated with a zero time average, which results in the suppression of first-order single-particle hopping processes. The dynamics of this flat band system is entirely driven by correlations and described by exotic Hamiltonian and current operators. We employ exact diagonalization and compare our results with those of the conventional, undriven Bose-Hubbard system. We focus on the two main manifestations of superfluidity, the Hess-Fairbank effect and the metastability of supercurrents, with explicit inclusion of an impurity when relevant. Among the novel superfluid features, we highlight the presence of a cat-like ground state, with branches that have opposite crystal momentum but carry the same flux-dependent current, and the essential role of the interference between the collective components of the ground-state wave function. Calculation of the dynamic form factor reveals the presence of an acoustic mode that guarantees superfluidity in the thermodynamic limit.