Global Phase Diagram and Momentum Distribution of Single-Particle Excitations in Kondo insulators

Abstract

Kondo insulators are emerging as a simplified setting to study both magnetic and metal-to-insulator quantum phase transitions. Here, we study a half-filled Kondo lattice model defined on a magnetically frustrated Shastry-Sutherland geometry. We determine a "global" phase diagram that features a variety of zero-temperature phases; these include Kondo-destroyed antiferromagnetic and paramagnetic metallic phases in addition to the Kondo-insulator phase. Our result provides the theoretical basis for understanding how applying pressure to a Kondo insulator can close its hybridization gap, liberate the local-moment spins from the conduction electrons, and lead to a magnetically correlated metal. We also study the momentum distribution of the single-particle excitations in the Kondo insulating state, and illustrate how Fermi-surface-like features emerge as a precursor to the actual Fermi surfaces of the Kondo-destroyed metals. We discuss the implications of our results for Kondo insulators including SmB${}_6$.

5 pages, 5 figures, supplemental material 3 pages, 2 figures

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Cited by in corpus (7)

• Fermi surface in the absence of a Fermi liquid in the Kondo insulator SmB${}_6$
• Intrinsic bulk quantum oscillations in a bulk unconventional insulator SmB${}_6$
• Universal Signatures of Majorana-like Quasiparticles in Strongly Correlated Landau-Fermi Liquids
• SU($\mathbf{N}$) Kondo-Heisenberg chain: Phase diagram, Ising criticality, and the coexistence of heavy quasiparticles and valence bond solid order
• Topological Kondo semimetals emulated in hetero-bilayer transition metal dichalcogenides
• Global phase diagram of a spin-orbit-coupled Kondo lattice model on the honeycomb lattice
• Breakdown of coherence in Kondo alloys: crucial role of concentration vs band filling