Kondo effect in f-electron superlattices

Abstract

We demonstrate the importance of the Kondo effect in artificially created {\it f}-electron superlattices. We show that the Kondo effect does not only change the density of states of the {\it f}-electron layers, but is also the cause of pronounced resonances at the Fermi energy in the density of states of the non-interacting layers in the superlattice, which are between the {\it f}-electron layers. Remarkably, these resonances strongly depend on the structure of the superlattice; due to interference, the density of states at the Fermi energy can be strongly enhanced or even shows no changes at all. Furthermore, we show that by inserting the Kondo lattice layer into a three-dimensional (3D) metal, the gap of the Kondo insulating state changes from a full gap to a pseudo gap with quadratically vanishing spectral weight around the Fermi energy. Due to the formation of the Kondo insulating state in the {\it f}-electron layer, the superlattice becomes strongly anisotropic below the Kondo temperature. We prove this by calculating the in-plane and out-of-plane conductivity of the superlattice.

9 pages

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• Spin Density Waves in the Hubbard model - A DMFT approach
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• From Kondo Lattices to Kondo Superlattices
• Valence Fluctuations and Electric Reconstruction in the Extended Anderson Model on the Two-Dimensional Penrose Lattice
• Large and Small Fermi-Surface Spin Density Waves in the Kondo Lattice Model
• Quantum oscillations in strongly correlated topological Kondo insulators
• Emergent exotic superconductivity in artificially-engineered tricolor Kondo superlattices
• Emergent Coherent Lattice Behavior in Kondo Nanosystems
• Effects of an Additional Conduction Band on Singlet-Antiferromagnet Competition in the Periodic Anderson Model
• Strong-coupling limit of depleted Kondo- and Anderson-lattice models
• Controlling unconventional superconductivity in artificially engineered $f$-electron Kondo superlattices
• Crossover from conventional to inverse indirect magnetic exchange in the depleted Anderson lattice
• Quantum critical Mott transitions in a bilayer Kondo insulator-metal model system
• Valence Fluctuations in the Extended Anderson Lattice Model with Quasiperiodicity
• Structural and electrical characterization of the monolayer Kondo-lattice compound CePt${}_6$/Pt(111)
• Spectral changes in layered $f$-electron systems induced by Kondo hole substitution in the boundary-layer
• The surface density of states of layered {\it f}-electron materials
• Magnetism in f electron superlattices
• Degenerate orbital effect in a three orbital periodic Anderson model
• Universal Mott quantum criticality in a modified periodic Anderson model