Evolution of the Fermi Surface across a Magnetic Order-Disorder Transition in the Two-Dimensional Kondo Lattice Model: A Dynamical Cluster Approach

Abstract

We use the dynamical cluster approximation, with a quantum Monte Carlo cluster solver on clusters of up to 16 orbitals, to investigate the evolution of the Fermi surface across the magnetic order-disorder transition in the two-dimensional doped Kondo lattice model. In the paramagnetic phase we observe the generic hybridized heavy fermion band structure with large Luttinger volume. In the antiferromagnetic phase, the heavy fermion band drops below the Fermi surface giving way to hole pockets centered around k=(pi/2,pi/2) and equivalent points. In this phase Kondo screening does not break down but the topology of the resulting Fermi surface is that of a spin-density wave approximation in which the localized spins are frozen.

5 pages, 5 figures, v3 text restructured and results clarified

References in corpus (10)

• Quantum Cluster Theories
• Locally critical quantum phase transitions in strongly correlated metals
• Weak magnetism and non-Fermi liquids near heavy-fermion critical points
• Hall-effect evolution across a heavy-fermion quantum critical point
• The Dynamical Cluster Approximation: Non-Local Dynamics of Correlated Electron Systems
• Coherence scale of the Kondo lattice
• Spin and charge dynamics of the ferromagnetic and antiferromagnetic two-dimensional half-filled Kondo lattice model
• Fermi Surface Reconstruction without Breakdown of Kondo Screening at Quantum Critical Point
• Coexisting Kondo singlet state with antiferromagnetic long-range order: A possible ground state for Kondo insulators
• Coherence scale of the two-dimensional Kondo Lattice model

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