Interplay of Dirac fermions and heavy quasiparticles in solids

被引：25

作者：

Hoeppner, M. ^{[1
,2
]}

Seiro, S. ^{[3
]}

Chikina, A. ^{[2
]}

Fedorov, A. ^{[4
]}

Guettler, M. ^{[2
]}

Danzenbaecher, S. ^{[2
]}

Generalov, A. ^{[2
]}

Kummer, K. ^{[5
]}

Patil, S. ^{[2
]}

Molodtsov, S. L. ^{[6
]}

Kucherenko, Y. ^{[2
,7
]}

Geibel, C. ^{[3
]}

Strocov, V. N. ^{[8
]}

Shi, M. ^{[8
]}

Radovic, M. ^{[8
,9
]}

Schmitt, T. ^{[8
]}

Laubschat, C. ^{[2
]}

Vyalikh, D. V. ^{[2
,10
]}

机构：

[1] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany

[2] Tech Univ Dresden, Inst Solid State Phys, D-01062 Dresden, Germany

[3] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany

[4] Leibniz Inst Festkorper & Werkstoffforsch Dresden, D-01171 Dresden, Germany

[5] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[6] European XFEL GmbH, D-22761 Hamburg, Germany

[7] Natl Acad Sci Ukraine, Inst Met Phys, UA-03142 Kiev, Ukraine

[8] Paul Scherrer Inst, Swiss Light Sources, CH-5232 Villigen, Switzerland

[9] Ecole Polytech Fed Lausanne, Lab Neutron & Synchrotron Spect, IPMC, CH-1015 Lausanne, Switzerland

[10] St Petersburg State Univ, St Petersburg 198504, Russia

来源：

NATURE COMMUNICATIONS | 2013年 / 4卷

关键词：

ELECTRON; SPECTRUM; SURFACE; ORDER;

D O I：

10.1038/ncomms2654

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Many-body interactions in crystalline solids can be conveniently described in terms of quasiparticles with strongly renormalized masses as compared with those of non-interacting particles. Examples of extreme mass renormalization are on the one hand graphene, where the charge carriers obey the linear dispersion relation of massless Dirac fermions, and on the other hand heavy-fermion materials where the effective electron mass approaches the mass of a proton. Here we show that both extremes, Dirac fermions, like they are found in graphene and extremely heavy quasiparticles characteristic for Kondo materials, may not only coexist in a solid but can also undergo strong mutual interactions. Using the example of EuRh2Si2, we explicitly demonstrate that these interactions can take place at the surface and in the bulk. The presence of the linear dispersion is imposed solely by the crystal symmetry, whereas the existence of heavy quasiparticles is caused by the localized nature of the 4f states.

引用

页数：6

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