Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 27: CE: Poster Session

TT 27.38: Poster

Mittwoch, 24. März 2010, 14:00–18:00, Poster D1

Spectral properties of the three-dimensional Hubbard Model — •Sebastian Fuchs¹, Emanuel Gull², Matthias Troyer³, Mark Jarrell⁴, and Thomas Pruschke¹ — ¹Institut für Theoretische Physik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany — ²Department of Physics, Columbia University, W 120th Street New York, NY 10027, USA — ³Institut für Theoretische Physik, ETH Zürich, Wolfgang-Pauli-Str. 27, 8093 Zürich, Switzerland — ⁴Louisiana State Universtity, Baton Rouge, LA 70803, USA

We calculate momentum resolved single-particle spectra of the three-dimensional Hubbard Model. We perform Quantum Monte Carlo (QMC) simulations inside and outside the antiferromagnetically symmetry broken phase in the vicinity of the metal-insulator transition. The full lattice model is approximated by the Dynamical Cluster Approximation (DCA) and the resulting cluster model is solved using a QMC algorithm in continuous imaginary time. The absence of a time discretization error and Monte Carlo measurements in Matsubara frequencies enable us to analytically continue the self-energies directly by a Maximum Entropy calculation. Thus, momentum resolved single-particle spectra can be determined using Dyson’s equation.