Record Details

Title:
Multiband dual fermion approach to quantum criticality in the Hubbard honeycomb lattice
Affiliation(s):
XFEL.EU staff, Other
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Abstract:
We study the Hubbard model on the honeycomb lattice in the vicinity of the quantum critical point by means of a multiband formulation of the dual fermion approach. Beyond the strong local correlations of the dynamical mean field, critical fluctuations on all length scales are included by means of a ladder diagram summation. Analysis of the susceptibility yields an estimate of the critical interaction strength of the quantum phase transition from a paramagnetic semimetal to an antiferromagnetic insulator, in good agreement to other numerical methods. We further estimate the crossover temperature to the renormalized classical regime. Our data imply that, at large interaction strengths, the Hubbard model on the honeycomb lattice behaves like a quantum nonlinear σ model, while displaying signs of non-Fermi-liquid behavior.
Imprint:
American Physical Society, 2018
Journal Information:
Physical Review B, 97 (11), 115150 (2018)
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Language(s):
English


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 Record created 2018-07-11, last modified 2018-07-11

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