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arXiv 1704.03437cond-mat.stat-mech
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半无限量子Ising链连接后的弹道前沿动力学

Ballistic front dynamics after joining two semi-infinite quantum Ising chains

Gabriele Perfetto, Andrea Gambassi

摘要:

我们考虑两个半无限量子伊辛链最初在两个不同的温度下处于热平衡,随后通过它们的端点之间的相互作用连接。输运性质,如热流是由动力学的左,右移动的费米子准粒子的特点,随后的幺正动力学。在所谓的半经典时空标度限制,我们扩展已知的结果,通过确定完整的空间和时间的依赖性的密度和电流的能量和费米子准粒子。在接近传播前沿的边缘时,这些量以及两点关联函数显示出定性上不同的行为,这取决于链的横向场是否临界。而在后一种情况下,如预期的那样,由艾里核描述的领先行为的校正,在前者中,出现了一种新的缩放形式与通用功能。

英文摘要:

We consider two semi-infinite quantum Ising chains initially at thermal equilibrium at two different temperatures and subsequently joined by an interaction between their end points. Transport properties such as the heat current are determined by the dynamics of the left- and right-moving fermionic quasi-particles which characterize the ensuing unitary dynamics. Within the so-called semi-classical space-time scaling limit we extend known results by determining the full space and time dependence of the density and current of energy and of fermionic quasi-particles. Upon approaching the edge of the propagating front, these quantities as well as the two-point correlation function display qualitatively different behaviors depending on the transverse field of the chain being critical or not. While in the latter case corrections to the leading behavior are described, as expected, by the Airy kernel, in the former a novel scaling form emerges with universal features.

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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