Detection of weak emergent broken-symmetries of the kagome antiferromagnet by Raman spectroscopy

被引：27

作者：

Cepas, O. ^{[1
]}

Haerter, J. O. ^{[1
,2
]}

huillier, C. I. ^{[1
]}

机构：

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

[2] Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 17期

关键词：

D O I：

10.1103/PhysRevB.77.172406

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We show that the magnetic Raman response of a spin liquid is independent of the polarizations of the light for triangular symmetries. In contrast, a ground state that has a broken-symmetry shows characteristic oscillations when the polarizations are rotated. This would allow one to detect weak broken-symmetries and emergent order parameters. We focus on the kagome antiferromagnet wherein no conventional long-range order has been found so far and present the Raman cross section of a spin liquid and a valence bond crystal by using a random phase approximation.

引用

页数：4

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