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arXiv 0908.3188cond-mat.stat-mechcond-mat.quant-gascond-mat.str-el
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一维费米子系统的量子猝灭和量子热化

Quantum quenches and thermalization in one-dimensional fermionic systems

Marcos Rigol

摘要:

我们研究了有限一维晶格中强关联费米子在量子猝灭后的动力学和热化过程。我们的计算是使用精确对角化。我们专注于一个和两个身体的观测量,如动量分布函数[n(k)]和密度-密度结构因子[N(k)],分别研究接近可积点的影响。我们表明,虽然费米子的弛豫动力学和热化的N(k)是非常相似的硬核玻色子之一,n(k)的行为是明显不同的。后一个观察到的表现出较慢的弛豫动力学在费米子系统。我们确定了这种行为的起源,这是有关的非对角矩阵元素的基础上的哈密顿量的本征态。更一般地说,我们发现热化发生在远离可积性的地方,当接近可积点时,热化就消失了。

英文摘要:

We study the dynamics and thermalization of strongly correlated fermions in finite one-dimensional lattices after a quantum quench. Our calculations are performed using exact diagonalization. We focus on one- and two-body observables such as the momentum distribution function [n(k)] and the density-density structure factor [N(k)], respectively, and study the effects of approaching an integrable point. We show that while the relaxation dynamics and thermalization of N(k) for fermions is very similar to the one of hardcore bosons, the behavior of n(k) is distinctively different. The latter observable exhibits a slower relaxation dynamics in fermionic systems. We identify the origin of this behavior, which is related to the off-diagonal matrix elements of n(k) in the basis of the eigenstates of the Hamiltonian. More generally, we find that thermalization occurs far away from integrability and that it breaks down as one approaches the integrable point.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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