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• W2016996231 abstract "The effect of Coulomb correlations in the half-filled Hubbard model of the honeycomb lattice is studied within the dynamical cluster approximation (DCA) combined with exact diagonalization (ED) and continuous-time quantum Monte Carlo (QMC), for unit cells consisting of six-site rings. The important difference between this approach and the previously employed cluster dynamical mean-field theory (CDMFT) is that DCA preserves the translation symmetry of the system, while CDMFT violates this symmetry. As the Dirac cones of the honeycomb lattice are the consequence of perfect long-range order, DCA yields semimetallic behavior at small on-site Coulomb interactions $U$, whereas CDMFT gives rise to a spurious excitation gap even for very small $U$. This basic difference between the two cluster approaches is found regardless of whether ED or QMC is used as the impurity solver. At larger values of $U$, the lack of translation symmetry becomes less important, so that the CDMFT reveals a Mott gap, in qualitative agreement with large-scale QMC calculations. In contrast, the semimetallic phase obtained in DCA persists even at $U$ values where CDMFT and large-scale QMC consistently show Mott-insulating behavior." @default.
• W2016996231 created "2016-06-24" @default.
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• W2016996231 date "2013-05-20" @default.
• W2016996231 modified "2023-10-17" @default.
• W2016996231 title "Coulomb correlations in the honeycomb lattice: Role of translation symmetry" @default.
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• W2016996231 doi "https://doi.org/10.1103/physrevb.87.205127" @default.
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