Dynamical instabilities and transient short-range order in the fermionic Hubbard model

Dynamical instabilities and transient short-range order in the fermionic Hubbard model
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费米子哈伯德模型中的动态不稳定性和瞬态短程有序

DOI:
10.1103/physrevb.92.024305
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发表时间:
2015
期刊:
影响因子:
3.7
通讯作者:
E Demler
E Demler
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
J Bauer;M Babadi;E Demler

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研究了半满费米Hubbard模型中磁关联随排斥作用快速上升的动力学行为。我们用Schwinger-Keldysh自洽的二阶微扰理论研究了单粒子绿色函数的演化,用求解非平衡Bethe-Salpeter方程的方法研究了磁关联的动力学.这种方法使我们对单粒子弛豫动力学和反铁磁相关性增长之间的相互作用有了新的认识。根据斜坡的时间和最终的相互作用的值,我们发现不同的动力学行为,我们说明使用动态相图。特别令人感兴趣的是出现了一个短暂的短程有序制度,其特征在于由强的反铁磁相关性的初始增长,然后由热化后的相关性衰减。所讨论的现象可以在光学晶格中的超冷原子的实验中进行探索。
We study the dynamics of magnetic correlations in the half-filled fermionic Hubbard model following a fast ramp of the repulsive interaction. We use Schwinger-Keldysh self-consistent second-order perturbation theory to investigate the evolution of single-particle Green's functions and solve the nonequilibrium Bethe-Salpeter equation to study the dynamics of magnetic correlations. This approach gives us new insights into the interplay between single-particle relaxation dynamics and the growth of antiferromagnetic correlations. Depending on the ramping time and the final value of the interaction, we find different dynamical behavior which we illustrate using a dynamical phase diagram. Of particular interest is the emergence of a transient short-range ordered regime characterized by the strong initial growth of antiferromagnetic correlations followed by a decay of correlations upon thermalization. The discussed phenomena can be probed in experiments with ultracold atoms in optical lattices.
DOI: 10.1126/science.44.1129.244
发表时间: --
期刊: Science
影响因子: 56.9
作者:
V. Gates;.. M. L. Ludwig-M.-L.-Ludwig-2273875465;J. A. Hartsuck;T. A. Steitz;H. Muirhead;J. C. Coppola;G. N. Reeke
通讯作者: V. Gates;.. M. L. Ludwig-M.-L.-Ludwig-2273875465;J. A. Hartsuck;T. A. Steitz;H. Muirhead;J. C. Coppola;G. N. Reeke
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