Filling-enforced nonsymmorphic Kondo semimetals in two dimensions

We study the competition between Kondo screening and frustrated magnetism on the nonsymmorphic Shastry-Sutherland Kondo lattice at a filling of two conduction electrons per unit cell. This model is known to host a set of gapless partially Kondo screened phases intermediate between the Kondo-destroyed paramagnet and the heavy Fermi liquid. Based on crystal symmetries, we argue that (i) both the paramagnet and the heavy Fermi liquid are semimetals protected by a glide symmetry; and (ii) partial Kondo screening breaks the symmetry, removing this protection and allowing the partially Kondo screened phase to be deformed into a Kondo insulator via a Lifshitz transition. We confirm these results using large-N mean-field theory and then use nonperturbative arguments to derive a generalized Luttinger sum rule constraining the phase structure of two-dimensional nonsymmorphic Kondo lattices beyond the mean-field limit.
Publisher
AMER PHYSICAL SOC
Issue Date
2017-08
Language
English
Keywords

QUANTUM PHASE-TRANSITIONS; HEAVY-FERMION METALS; CRITICALITY; DIAGRAM; SURFACE; LIQUIDS; LATTICE

Citation

PHYSICAL REVIEW B, v.96, no.8

ISSN
2469-9950
DOI
10.1103/PhysRevB.96.081105
URI
http://hdl.handle.net/10203/225671
Appears in Collection
PH-Journal Papers(저널논문)
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