Variational Monte Carlo approach to the two-dimensional Kondo lattice model

Abstract

We study the phase diagram of the Kondo-lattice model with nearest-neighbor hopping in the square lattice by means of the variational Monte Carlo technique. Specifically, we analyze a wide class of variational wave functions that allow magnetic and superconducting order parameters, so to assess the possibility that superconductivity might emerge close to the magnetic instability, as often observed in heavy fermion systems. Indeed, we do find evidence of d-wave superconductivity in the paramagnetic sector, i.e., when magnetic order is not allowed in the variational wave function. However, when magnetism is allowed, it completely covers the superconducting region, which thus disappears from the phase diagram.

7 pages and 9 figures

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• Correlation-driven multigap d-wave superconductivity in Anderson lattice model
• Gutzwiller Wave-Function Solution for Anderson Lattice Model: Emerging Universal Regimes of Heavy Quasiparticle States
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• Spiral magnetic phases on the Kondo Lattice Model: A Hartree-Fock approach
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• Altermagnetism in Heavy Fermion Systems: Mean-Field study on Kondo Lattice
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• Frustrated quantum magnetism in the Kondo lattice on the zigzag ladder
• Ultrafast Optical Control of Magnetic Order and Fermi Surface Topology at a Quantum Critical Point
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• Quasiparticle Band Structure and Spin Excitation Spectrum of the Kondo Lattice
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• Fermionology in the Kondo-Heisenberg model: the case of CeCoIn${}_5$
• Magnetism in f electron superlattices
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• Degenerate orbital effect in a three orbital periodic Anderson model
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• Reentrant $s$-wave superconductivity in the periodic Anderson model with attractive conduction band Hubbard interaction
• Lifshitz Transition in Triangular Lattice Kondo-Heisenberg Model