6533b874fe1ef96bd12d625c
RESEARCH PRODUCT
Momentum-dependent pseudogaps in the half-filled two-dimensional Hubbard model
E. V. GorelikFakher F. AssaadDaniel RostN. Blümersubject
Condensed Matter::Quantum GasesPhysicsStrongly Correlated Electrons (cond-mat.str-el)Condensed matter physicsHubbard modelCondensed Matter - SuperconductivityQuantum Monte CarloFOS: Physical sciencesCharge (physics)FermionCondensed Matter PhysicsCoupling (probability)Electronic Optical and Magnetic MaterialsSuperconductivity (cond-mat.supr-con)MomentumCondensed Matter - Strongly Correlated ElectronsQuantum Gases (cond-mat.quant-gas)Condensed Matter::Strongly Correlated ElectronsStrongly correlated materialCondensed Matter - Quantum GasesPseudogapdescription
We compute unbiased spectral functions of the two-dimensional Hubbard model by extrapolating Green functions, obtained from determinantal quantum Monte Carlo simulations, to the thermodynamic and continuous time limits. Our results clearly resolve the pseudogap at weak to intermediate coupling, originating from a momentum selective opening of the charge gap. A characteristic pseudogap temperature T*, determined consistently from the spectra and from the momentum dependence of the imaginary-time Green functions, is found to match the dynamical mean-field critical temperature, below which antiferromagnetic fluctuations become dominant. Our results identify a regime where pseudogap physics is within reach of experiments with cold fermions in optical lattices.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-05-30 | Physical Review B |