Spin transport in a long-range-interacting spin chain

被引：24

作者：

Kloss, Benedikt ^{[1
]}

Bar Lev, Yevgeny ^{[2
]}

机构：

[1] Columbia Univ, Dept Chem, 3000 Broadway, New York, NY 10027 USA

[2] Ben Gurion Univ Negev, Dept Phys, IL-84105 Beer Sheva, Israel

来源：

PHYSICAL REVIEW A | 2019年 / 99卷 / 03期

基金：

美国国家科学基金会;

关键词：

MATRIX RENORMALIZATION-GROUP; VIBRATIONAL-MODES; COUPLED ELECTRON; QUANTUM; DYNAMICS; DELOCALIZATION; LOCALIZATION; ENTANGLEMENT; PROPAGATION; TIME;

D O I：

10.1103/PhysRevA.99.032114

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We numerically study spin transport and spin-density profiles after a local quench in a clean one-dimensional spin chain with long-range interactions, decaying as a power law, r(-alpha) with distance. We find two distinct regimes of transport: for alpha < 1/2, spin excitations relax instantaneously in the thermodynamic limit, and for alpha > 1/2, spin transport combines both diffusive and superdiffusive features. We show that while for alpha > 3/2 the spin diffusion coefficient is finite, transport in the system is never strictly diffusive, contrary to corresponding classical systems.

引用

页数：7

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