Quantum phase transition in the quantum compass model
نویسندگان
چکیده
منابع مشابه
Quantum phase transition in the quantum compass model
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 Jx=Jz marks a first-order phase transition. ...
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Xiao-Feng Shi,1,2,3 Yue Yu,4 J. Q. You,1,2,3 and Franco Nori2,3,5 1Department of Physics and Surface Physics Laboratory (National Key Laboratory), Fudan University, Shanghai 200433, China 2Advanced Science Institute, The Institute of Physical and Chemical Research (RIKEN), Wako-shi 351-0198, Japan 3CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan 4Institute of Theo...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 2007
ISSN: 1098-0121,1550-235X
DOI: 10.1103/physrevb.75.144401