Exact spin dynamics of inhomogeneous 1-d systems at high temperature

被引：5

作者：

Danieli, EP ^{[1
]}

Pastawski, HM ^{[1
]}

Levstein, PR ^{[1
]}

机构：

[1] Univ Nacl Cordoba, Fac Matemat Astron & Fis, LANAIS, RMS, RA-5000 Cordoba, Argentina

来源：

PHYSICA B-CONDENSED MATTER | 2002年 / 320卷 / 1-4期

关键词：

spin difussion; mesoscopic echoes; decoherence;

D O I：

10.1016/S0921-4526(02)00746-9

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The evaluation of spin excitation dynamics in finite 1-d systems of spins 1/2 with XY exchange interaction J acquired new interest because NMR experiments at high temperature (k(B)Tmuch greater thanJ) confirmed the predicted spin wave behavior of mesoscopic echoes. In this work, we use the Jordan-Wigner transformation to obtain the exact dynamics of inhomogeneous chains and rings where the evolution is reduced to one-body dynamics. For higher dimensions, the spin excitations manifest many-body effects that can be interpreted as a simple dynamics of non-interacting fermions plus a decoherent process. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：351 / 353

页数：3

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