Quantum Criticality Due to Incipient Phase Separation in the Two-dimensional Hubbard Model

Details Quantum Criticality Due to Incipient Phase Separation in the Two-dimensional Hubbard Model Quantum Criticality Due to Incipient Phase Separation in the Two-dimensional Hubbard Model

2009-09-03

arxiv.org/abs/0909.0759v3

Phys. Rev. B 81, 201101(R) (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures.

Scientific paper

10.1103/PhysRevB.81.201101

We investigate the two-dimensional Hubbard model with next-nearest-neighbor hopping, t', using the dynamical cluster approximation. We confirm the existence of a first-order phase-separation transition terminating at a second-order critical point at filling n_c(t') and temperature T_ps(t'). We find that as t' approaches zero, T_ps(t') vanishes and n_c(t') approaches the filling associated with the quantum critical point separating the Fermi liquid from the pseudogap phase. We propose that the quantum critical point under the superconducting dome is the zero-temperature limit of the line of second-order critical points.

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