论文标题
旋转状态过渡附近的非热激发凝结
Nonthermal excitonic condensation near a spin-state transition
论文作者
论文摘要
我们考虑了带有hund耦合和晶体场分裂的两轨哈币模型，并表明在高旋转/低旋转过渡的附近，晶体场淬灭可以在平衡中最高排序温度的初始温度下诱导兴奋子凝结。这种凝结是旋转熵增加和有效电子温度的相关冷却的效果。我们确定了动力学相变，并表明这种淬灭会导致长寿命的非热激素冷凝物，这些冷凝水在平衡相图中没有类似物。结果是通过有效的伪自旋模型来解释的。
We consider a two-orbital Hubbard model with Hund coupling and crystal-field splitting and show that in the vicinity of the high-spin/low-spin transition, crystal-field quenches can induce an excitonic condensation at initial temperatures above the highest ordering temperature in equilibrium. This condensation is the effect of an increase in the spin entropy and an associated cooling of the effective electronic temperature. We identify a dynamical phase transition and show that such quenches can result in long-lived nonthermal excitonic condensates which have no analogue in the equilibrium phase diagram. The results are interpreted by means of an effective pseudo-spin model.
