Deconfined quantum criticality in the two dimensional Kondo lattice model

Details Deconfined quantum criticality in the two dimensional Kondo lattice model Deconfined quantum criticality in the two dimensional Kondo lattice model

2005-05-10

arxiv.org/abs/cond-mat/0505230v2

Phys. Rev. B 72, 144426 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.72.144426

We investigate the continuous quantum phase transition from an antiferromagnetic metal to a heavy fermion liquid based on the Kondo lattice model in two dimensions. We propose that antiferromagnetic spin fluctuations and conduction electrons fractionalize into neutral bosonic spinons and charged spinless fermions at the quantum critical point. This deconfined quantum criticality leads us to establish a critical field theory in terms of the fractionalized fields interacting via emergent U(1) gauge fields. The critical field theory not only predicts non-Fermi liquid physics near the quantum critical point but also recovers Fermi liquid physics away from the quantum critical point.

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