Quantum Phase Transition in the One-Dimensional XZ Model

被引：33

作者：

Brzezicki, W. ^{[1
]}

Oles, A. M. ^{[1
,2
]}

机构：

[1] Jagiellonian Univ, M Smoluchowski Inst Phys, PL-30059 Krakow, Poland

[2] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

来源：

ACTA PHYSICA POLONICA A | 2009年 / 115卷 / 01期

关键词：

D O I：

10.12693/APhysPolA.115.162

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We introduce a one-dimensional XZ model with alternating sigma(z)(i)sigma(z)(i+1) and sigma(x)(i)sigma(x)(i+1), interactions on even/odd bonds, interpolating between the Ising model and the quantum compass model. We present two ways of its exact solution by: (i) mapping to the quantum Ising models, and (ii) using fermions with spin 1/2. In certain cases the nearest neighbor pseudospin correlations change discontinuously at the quantum phase transition, where one finds highly degenerate ground state of the 1D compass model.

引用

页码：162 / 164

页数：3

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