论文标题
二维四极系统的量子相变
Quantum phase transition of a two-dimensional quadrupolar system
论文作者
论文摘要
与颗粒之间具有远距离相互作用的合奏有望揭示强量量子集体效应和多体现象。在这里，我们研究了使用扩散的蒙特卡洛技术，研究具有四维玻色系统的地面相图。我们预测从气体到固相的量子相变。过渡点处的Lindemann比率和冷凝物分数为$γ= 0.269（4）$和$ n_0/n = 0.031（4）$，相应地。我们观察到集体激发分支在相变点附近的强烈旋转化。可以使用各种性质的最先进的实验系统来探测我们的结果，例如在过渡金属二甲基元素（TMD）三层二甲甲基三元素（TMD）中的Quasi-Two维二维系统，四极管分子，激进剂或rydberg原子具有强力磁场。
Ensembles with long-range interactions between particles are promising for revealing strong quantum collective effects and many-body phenomena. Here we study the ground-state phase diagram of a two-dimensional Bose system with quadrupolar interactions using a diffusion Monte Carlo technique. We predict a quantum phase transition from a gas to a solid phase. The Lindemann ratio and the condensate fraction at the transition point are $γ=0.269(4)$ and $n_0/n=0.031(4)$, correspondingly. We observe the strong rotonization of the collective excitation branch in the vicinity of the phase transition point. Our results can be probed using state-of-the-art experimental systems of various nature, such as quasi-two-dimensional systems of quadrupolar excitons in transition metal dichalcogenide (TMD) trilayers, quadrupolar molecules, and excitons or Rydberg atoms with quadrupole moments induced by strong magnetic fields.
