Collective Modes in Excitonic Magnets: Dynamical Mean-Field Study

被引：41

作者：

Geffroy, D. ^{[1
,2
]}

Kaufmann, J. ^{[2
]}

Hariki, A. ^{[2
]}

Gunacker, P. ^{[2
]}

Hausoel, A. ^{[3
]}

Kunes, J. ^{[2
,4
]}

机构：

[1] Masaryk Univ, Fac Sci, Dept Condensed Matter Phys, Kotlarska 2, CS-61137 Brno, Czech Republic

[2] TU Wien, Inst Solid State Phys, A-1040 Vienna, Austria

[3] Univ Wurzburg, Inst Theoret Phys & Astrophys, D-97074 Wurzburg, Germany

[4] Czech Acad Sci, Inst Phys, Slovance 2, Prague 18221 8, Czech Republic

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 122卷 / 12期

基金：

欧洲研究理事会; 欧盟地平线“2020”;

关键词：

ELECTRONIC-STRUCTURE CALCULATIONS; ANALYTIC CONTINUATION; MAXIMUM-ENTROPY; HUBBARD-MODEL; HIGGS MODE; QUANTUM; SYSTEMS; PHASE; ORDER;

D O I：

10.1103/PhysRevLett.122.127601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a dynamical mean-field study of dynamical susceptibilities in the two-band Hubbard model. Varying the model parameters we analyze the two-particle excitations in the normal as well as in the ordered phase, an excitonic condensate. The two-particle dynamical mean-field theory spectra in the ordered phase reveal the gapless Goldstone modes arising from spontaneous breaking of continuous symmetries. We also observe the gapped Higgs mode, characterized by vanishing of the gap at the phase boundary. Qualitative changes observed in the spin susceptibility can be used as an experimental probe to identify the excitonic condensation.

引用

页数：6

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