Fermi Surface Reconstruction without Breakdown of Kondo Screening at Quantum Critical Point

Details Fermi Surface Reconstruction without Breakdown of Kondo Screening at Quantum Critical Point Fermi Surface Reconstruction without Breakdown of Kondo Screening at Quantum Critical Point

2007-04-13

arxiv.org/abs/0704.1722v1

Phys. Rev. Lett. 99, 136401 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.99.136401

Motivated by recent Hall-effect experiment in YbRh$_2$Si$_2$, we study ground state properties of a Kondo lattice model in a two-dimensional square lattice using variational Monte Carlo method. We show that there are two types of phase transition, antiferromagnetic transition and topological one (Fermi surface reconstruction). In a wide region of parameters, these two transitions occur simultaneously without the breakdown of Kondo screening, accompanied by a discontinuous change of the Hall coefficient. This result is consistent with the experiment and gives a novel theoretical picture for the quantum critical point in heavy fermion systems.

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