Dynamics of a Two-Dimensional Quantum Spin Liquid: Signatures of Emergent Majorana Fermions and Fluxes

被引：289

作者：

Knolle, J. ^{[1
]}

Kovrizhin, D. L. ^{[1
,2
,3
]}

Chalker, J. T. ^{[4
]}

Moessner, R. ^{[1
]}

机构：

[1] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany

[2] Univ Cambridge, Cavendish Lab, TCM Grp, Cambridge CB3 0HE, England

[3] Univ London Imperial Coll Sci Technol & Med, London SW7 2AZ, England

[4] Univ Oxford, Oxford OX1 3NP, England

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 112卷 / 20期

基金：

英国工程与自然科学研究理事会;

关键词：

EXCITATIONS; SCATTERING; METALS;

D O I：

10.1103/PhysRevLett.112.207203

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We provide a complete and exact theoretical study of the dynamical structure factor of a two-dimensional quantum spin liquid in gapless and gapped phases, as realized in Kitaev's honeycomb model. We show that there are direct signatures-qualitative and quantitative-of the Majorana fermions and gauge fluxes emerging in this model. These include counterintuitive manifestations of quantum number fractionalization, such as a neutron scattering response with a gap even in the presence of gapless excitations, and a sharp component despite the fractionalization of electron spin. Our analysis identifies new varieties of the venerable x-ray edge problem and explores connections to the physics of quantum quenches.

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