Higgs mode and magnon interactions in 2D quantum antiferromagnets from Raman scattering

被引：18

作者：

Weidinger, Simon Adrian ^{[1
]}

Zwerger, Wilhelm ^{[1
]}

机构：

[1] Tech Univ Munich, Dept Phys, D-85747 Garching, Germany

来源：

EUROPEAN PHYSICAL JOURNAL B | 2015年 / 88卷 / 09期

关键词：

X-RAY-SCATTERING; FLUCTUATIONS; TRANSITION; LIGHT;

D O I：

10.1140/epjb/e2015-60438-1

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We present a theory for Raman scattering on 2D quantum antiferromagnets. The microscopic Fleury-Loudon Hamiltonian is expressed in terms of an effective O(3)-model. Well within the Neel ordered phase, the Raman spectrum contains a two-magnon and a two-Higgs contribution, which are calculated diagramatically. The vertex functions for both the Higgs and magnon contributions are determined from a numerical solution of the corresponding Bethe-Salpeter equation. Due to the momentum dependence of the Raman vertex in the relevant B-1g + E-2g symmetry, the contribution from the Higgs mode is strongly suppressed. Except for intermediate values of the Higgs mass, it does not show up as separate peak in the spectrum but gives rise to a broad continuum above the dominant contribution from two-magnon excitations. The latter give rise to a broad, asymmetric peak at omega similar or equal to 2.44 J, which is a result of magnon-magnon interactions mediated by the Higgs mode. The full Raman spectrum is determined completely by the antiferromagnetic exchange coupling J and a dimensionless Higgs mass. Experimental Raman spectra of undoped cuprates turn out to be in very good agreement with the theory only with inclusion of the Higgs contribution. They thus provide a clear signature of the presence of a Higgs mode in spin one-half 2D quantum antiferromagnets.

引用

页数：12

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