Fermi surface enlargement on the Kondo lattice

Eoin Quinn, Onur Erten

Research output: Contribution to journalArticle

Abstract

The Kondo lattice model is a paradigmatic model for the description of local moment systems, a class of materials exhibiting a range of strongly correlated phenomena including heavy fermion formation, magnetism, quantum criticality, and unconventional superconductivity. Conventional theoretical approaches invoke fractionalization of the local moment spin through large-N and slave particle methods. In this work we develop a formalism based on noncanonical degrees of freedom, building upon a recently developed approach for strongly correlated electrons [E. Quinn, Phys. Rev. B 97, 115134 (2018)10.1103/PhysRevB.97.115134]. Specifically, we demonstrate that higher dimensional representations of su(2|2) correspond to a splitting of the electronic degree of freedom on the Kondo lattice, in a manner which entwines the conduction electrons with the local moment spins. This provides a powerful means of organizing correlations, and offers a perspective on heavy fermion formation. Unlike slave-particle methods, noncanonical degrees of freedom generically allow for a violation of the Luttinger sum rule, and we interpret recent angle resolved photoemission experiments on Ce-115 systems in view of this.

Original languageEnglish (US)
Article number245123
JournalPhysical Review B
Volume99
Issue number24
DOIs
StatePublished - Jun 11 2019

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Fermi surface
Fermions
Crystal lattices
Fermi surfaces
degrees of freedom
moments
Electrons
Magnetism
Photoemission
Superconductivity
fermions
organizing
conduction electrons
sum rules
photoelectric emission
superconductivity
formalism
Experiments
electronics
electrons

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Fermi surface enlargement on the Kondo lattice. / Quinn, Eoin; Erten, Onur.

In: Physical Review B, Vol. 99, No. 24, 245123, 11.06.2019.

Research output: Contribution to journalArticle

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