论文标题
部分可观测时空混沌系统的无模型预测
BCS-BEC Crossover of Triplet Exciton Condensation in Bilayer Systems
论文作者
论文摘要
我们使用半填充的双层式哈伯德模型研究了三胞胎激子冷凝的BCS-BEC跨界现象。我们计算动力学自旋结构因子和抗磁性有序和无序相之间相边界上的激子功能。在BCS制度中，粒子孔结合态的形成和凝结，即激子，同时出现在相变点，并在真实空间中扩展了激子波函数。另一方面，在BEC状态下，在整个Brillouin区域也有很好的定义，在无序阶段，粒子孔对的大小小于晶格空间。电荷 - 旋转轨道纠缠状态的量子临界性可以从跨界方案中的中间耦合材料中出现。
We study the BCS-BEC crossover phenomenon of triplet exciton condensation using a half-filled bilayer Hubbard model. We calculate the dynamical spin structure factor and the exciton wave function on the phase boundary between the antiferromagnetically ordered and disordered phases. In the BCS regime, the formation and condensation of particle-hole bound states, namely excitons, occur simultaneously at the phase transition point, and the exciton wave function is extended in real space. In the BEC regime, on the other hand, bound states are well defined over the whole Brillouin zone also in the disordered phase, and the size of particle-hole pairs is smaller than a lattice space. Quantum criticality of charge-spin-orbital entangled states can emerge from intermediate coupling materials in the crossover regime.
