Schwinger-boson approach to the kagome antiferromagnet with Dzyaloshinskii-Moriya interactions: Phase diagram and dynamical structure factors

被引：81

作者：

Messio, L. ^{[1
]}

Cepas, O. ^{[2
,3
]}

Lhuillier, C. ^{[1
]}

机构：

[1] Univ Paris 06, Lab Phys Theor Mat Condensee, UMR 7600, CNRS, F-75252 Paris 05, France

[2] Univ Grenoble 1, F-38042 Grenoble 9, France

[3] CNRS, Inst Neel, F-38042 Grenoble 9, France

来源：

PHYSICAL REVIEW B | 2010年 / 81卷 / 06期

关键词：

MEAN-FIELD THEORY; HEISENBERG-MODEL; FINITE-SIZE; QUANTUM ANTIFERROMAGNETS; WEAK FERROMAGNETISM; LARGE-N; LATTICE; EXCITATIONS; STATES; ORDER;

D O I：

10.1103/PhysRevB.81.064428

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have obtained the zero-temperature phase diagram of the kagome antiferromagnet with Dzyaloshinskii-Moriya interactions in Schwinger-boson mean-field theory. We find quantum phase transitions (first or second order) between different topological spin-liquid and Neel-ordered phases (either the root 3 x root 3 state or the so-called Q = 0 state). In the regime of small Schwinger-boson density, the results bear some resemblances with exact diagonalization results and we briefly discuss some issues of the mean-field treatment. We calculate the equal-time structure factor(and its angular average to allow for a direct comparison with experiments on powder samples), which extends earlier work on the classical kagome to the quantum regime. We also discuss the dynamical structure factors of the topological spin-liquid and the Neel-ordered phases.

引用

页数：8

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