Correlations generated from high-temperature states: Nonequilibrium dynamics in the Fermi-Hubbard model
Correlations generated from high-temperature states: Nonequilibrium dynamics in the Fermi-Hubbard model
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DOI：
10.1103/physreva.100.033612
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发表时间：
2016-12
影响因子：
2.9
通讯作者：
Ian R White;R. Hulet;K. Hazzard
中科院分区：
文献类型：
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作者：
Ian R White;R. Hulet;K. Hazzard
我们研究费米-哈伯德模型的相互作用淬灭从各种高温和高能量的状态，由冷原子实验的动机，目前操作的有序温度以上（S）。我们分析计算从这些初始状态，这往往是强相互作用，非相互作用的限制淬火的动力学。即使对于高温不相关的初始状态，瞬态连接的相关性发展。对于所有考虑的初始状态，这些相关性具有许多共同特征。我们观察到光锥传播的相互交织的自旋和密度的相关性。这些关联的性质与它们的低温平衡对应物有很大的不同：例如，自旋关联可以是铁磁性的。我们还表明，一个初始本地化的空穴缺陷影响自旋相关附近的孔，抑制其幅度和改变其符号。
We study interaction quenches of the Fermi-Hubbard model initiated from various high-temperature and high-energy states, motivated by cold atom experiments, which currently operate above the ordering temperature(s). We analytically calculate the dynamics for quenches from these initial states, which are often strongly-interacting, to the non-interacting limit. Even for high-temperature uncorrelated initial states, transient connected correlations develop. These correlations share many features for all considered initial states. We observe light-cone spreading of intertwined spin and density correlations. The character of these correlations is quite different from their low-temperature equilibrium counterparts: for example, the spin correlations can be ferromagnetic. We also show that an initially localized hole defect affects spin correlations near the hole, suppressing their magnitude and changing their sign.