Quantum phase transition in the quantum compass model

2006/12/07 by Han-Dong Chen, Chen Fang, Jiangping Hu +1 · 3 citations
Computer Science · Physics and Astronomy · #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum many-body systems #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.75.144401

published as Phys Rev B 75, 144401 (2007) · 7 pages, 10 figs

arxiv created 2006/12/07 · openalex publication_date 2007/04/02 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/06/11

Abstract

In this work, we show that the quantum compass model on a square lattice can be mapped to a fermionic model with local-density interaction. We introduce a mean-field approximation where the most important fluctuations, those perpendicular to the ordering direction, are taken into account exactly. It is found that the quantum phase transition point at J_x=J_z marks a first-order phase transition. We also show that the mean-field result is robust against the remaining fluctuation corrections up to the second order.

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