Long-range Coulomb interaction in nodal-ring semimetals

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Recently there have been several proposals of materials predicted to be nodal-ring semimetals, where zero energy excitations are characterized by a nodal ring in the momentum space. This class of materials falls between the Dirac-like semimetals and the more conventional Fermi-surface systems. As a step towards understanding this unconventional system, we explore the effects of the long-range Coulomb interaction. Due to the vanishing density of states at the Fermi level, Coulomb interaction is only partially screened and remains long-ranged. Through renormalization group and large-Nf computations, we have identified a nontrivial interacting fixed point. The screened Coulomb interaction at the interacting fixed point is an irrelevant perturbation, allowing controlled perturbative evaluations of physical properties of quasiparticles. We discuss unique experimental consequences of such quasiparticles: acoustic wave propagation, anisotropic dc conductivity, and renormalized phonon dispersion as well as energy dependence of quasiparticle lifetime.
Publisher
AMER PHYSICAL SOC
Issue Date
2016-01
Language
English
Article Type
Article
Keywords

TOPOLOGICAL DIRAC SEMIMETAL; INSULATORS; DISCOVERY; PHASE; METAL

Citation

PHYSICAL REVIEW B, v.93, no.3, pp.013138

ISSN
2469-9950
DOI
10.1103/PhysRevB.93.035138
URI
http://hdl.handle.net/10203/208022
Appears in Collection
PH-Journal Papers(저널논문)
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