Spatially inhomogeneous phase in the two-dimensional repulsive Hubbard model

Details Spatially inhomogeneous phase in the two-dimensional repulsive Hubbard model Spatially inhomogeneous phase in the two-dimensional repulsive Hubbard model

2008-05-30

arxiv.org/abs/0805.4831v2

Phys. Rev. B 78, 165101 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures. title changed, final version accepted for publication

Scientific paper

10.1103/PhysRevB.78.165101

Using recent advances in auxiliary-field quantum Monte Carlo techniques and the phaseless approximation to control the sign/phase problem, we determine the equation of state in the ground state of the two-dimensional repulsive single-band Hubbard model at intermediate interactions. Shell effects are eliminated and finite-size effects are greatly reduced by boundary condition integration. Spin-spin correlation functions and structure factors are also calculated. In lattice sizes up to $16\times 16$, the results show signal for phase-separation. Upon doping, the system separates into one phase of density $n=1$ (hole-free) and the other at density $n_c$ ($\sim 0.9$). The long-range antiferromagnetic order is coupled to this process, and is lost below $n_c$.

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