Behavior near θ = π of the mass gap in the two-dimensional O(3) nonlinear sigma model

被引：20

作者：

Alles, B. ^{[1
]}

Giordano, M. ^{[2
]}

Papa, A. ^{[3
,4
]}

机构：

[1] Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy

[2] Hungarian Acad Sci ATOMKI, Inst Nucl Res, H-4026 Debrecen, Hungary

[3] Univ Calabria, Dipartimento Fis, I-87036 Cosenza, Italy

[4] Ist Nazl Fis Nucl, Grp Collegato Cosenza, I-87036 Cosenza, Italy

来源：

PHYSICAL REVIEW B | 2014年 / 90卷 / 18期

关键词：

SPIN-1 ANTIFERROMAGNETIC CHAIN; GROUND-STATE PROPERTIES; VACUUM; SIMULATIONS; FERROMAGNETS; SYSTEMS; FIELD;

D O I：

10.1103/PhysRevB.90.184421

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The validity of Haldane's conjecture entails that the mass gap of the two-dimensional O(3) nonlinear sigma model with a theta term must tend to zero as theta approaches the value pi by following a precise law. In the present paper we extract the related critical exponents by simulating the model at imaginary theta.

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页数：8

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