Strong quenches in the one-dimensional Fermi-Hubbard model
arXiv:1804.07547 · doi:10.1103/PhysRevA.98.033602
Abstract
The one-dimensional Fermi-Hubbard model is used as testbed for strong global parameter quenches. With the aid of iterated equations of motion in combination with a suitable scalar product for operators we describe the dynamics and the long-term behavior in particular of the system after interaction quenches. This becomes possible because the employed approximation allows for oscillatory dynamics avoiding spurious divergences. The infinite-time behavior is captured by an analytical approach based on stationary phases; no numerical averages over long times need to be computed. We study the most relevant frequencies in the dynamics after the quench and find that the local interaction as well as the band width dominate. In contrast to former studies a crossover instead of a sharp dynamical transition depending on the strength of the quench is identified. For weak quenches the band width is more important while for strong quenches the local interaction dominates.
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