Interplay of Dirac fermions and heavy quasiparticles in solids

Abstract

Many-body interactions in crystalline solids can be conveniently described in terms of quasiparticles with strongly renormalized masses as compared to 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 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 while the existence of heavy quasiparticles is caused by the localized nature of the 4f states.

4 pages, 4 figures

References in corpus (4)

• Electric Field Effect in Atomically Thin Carbon Films
• The electronic properties of graphene
• Fermi surface instability at the hidden-order transition of URu2Si2
• Optical study of archetypical valence-fluctuating Eu-systems

Cited by in corpus (9)

• Strong ferromagnetism at the surface of an antiferromagnet caused by buried magnetic moments
• Electronic and dynamical properties of CeRh${}_2$As${}_2$: Role of Rh${}_2$As${}_2$ layers and expected hidden orbital order
• Pressure-driven 4$f$ localized-itinerant crossover in heavy fermion compound CeIn${}_3$: A first-principles many-body perspective
• ARPES/STM study of the surface terminations and 5$f$-electron character in URu${}_2$Si${}_2$
• Probing Flat Band Physics in Spin Ice Systems via Polarized Neutron Scattering
• The first-principles research on the role of surface in the heavy fermion compound CeRh${}_2$Si${}_2$
• Hybridization and Correlation between f- and d-orbital electrons in a valence fluctuating compound EuNi2P2
• Emergence of heavy quasiparticles from a massless Fermi sea: Optical conductivity
• Photoemission insights into lanthanide-based crystals