Light-induced evaporative cooling of holes in the Hubbard model
Light-induced evaporative cooling of holes in the Hubbard model
复制标题
哈伯德模型中孔的光致蒸发冷却
作者：
P. Werner;M. Eckstein;M. Müller;G. Refael
在受驱动量子物质领域，一个难以实现的目标是诱导长程有序。在这里，我们提出了一个机制的基础上光诱导蒸发冷却的相关费米子系统中的孔。由于填充窄带的熵随着空穴掺杂而迅速增长，空穴从掺杂的Mott绝缘体到这样的带的等熵转移导致温度下降。强关联的费米液体和破缺态可以通过偶极激发产生。利用非平衡动力学平均场理论，我们表明，适当设计的啁啾脉冲可以实现这种冷却效果。特别是，我们证明了反铁磁秩序的出现在一个系统，最初是在一个弱相关的状态以上的最大内尔温度。我们的工作提出了一种在光晶格或光驱动材料中周期性调制的原子气体中诱导强关联现象的一般策略。驱动量子多体系统可以容纳有限密度的准粒子，并有可能实现与平衡态不同的涌现行为。Werner等人提出了一种方法来冷却相关系统中的空穴，以便可以达到更奇异的低熵相。
An elusive goal in the field of driven quantum matter is the induction of long-range order. Here, we propose a mechanism based on light-induced evaporative cooling of holes in a correlated fermionic system. Since the entropy of a filled narrow band grows rapidly with hole doping, the isentropic transfer of holes from a doped Mott insulator to such a band results in a drop of temperature. Strongly correlated Fermi liquids and symmetry-broken states could thus be produced by dipolar excitations. Using nonequilibrium dynamical mean field theory, we show that suitably designed chirped pulses may realize this cooling effect. In particular, we demonstrate the emergence of antiferromagnetic order in a system which is initially in a weakly correlated state above the maximum Néel temperature. Our work suggests a general strategy for inducing strong correlation phenomena in periodically modulated atomic gases in optical lattices or light-driven materials. Driven quantum many-body systems can host finite densities of quasiparticles with the potential to realise emergent behaviour that is distinct from the equilibrium state. Werner et al. propose a method to cool holes in a correlated system so that more exotic low-entropy phases can be reached.
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