6533b7d2fe1ef96bd125f60d

RESEARCH PRODUCT

Orbital-selective Mott transitions in the anisotropic two-band Hubbard model at finite temperatures

C. KnechtN. BlümerP. G. J. Van Dongen

subject

PhysicsStrongly Correlated Electrons (cond-mat.str-el)Hubbard modelCondensed matter physicsQuantum Monte CarloDegenerate energy levelsFOS: Physical sciencesCondensed Matter PhysicsSpectral lineElectronic Optical and Magnetic MaterialsMott transitionCondensed Matter - Strongly Correlated ElectronsMean field theoryQuantum mechanicsStrongly correlated materialCondensed Matter::Strongly Correlated ElectronsAnisotropy

description

The anisotropic degenerate two-orbital Hubbard model is studied within dynamical mean-field theory at low temperatures. High-precision calculations on the basis of a refined quantum Monte Carlo (QMC) method reveal that two distinct orbital-selective Mott transitions occur for a bandwidth ratio of 2 even in the absence of spin-flip contributions to the Hund exchange. The second transition -- not seen in earlier studies using QMC, iterative perturbation theory, and exact diagonalization -- is clearly exposed in a low-frequency analysis of the self-energy and in local spectra.

yearjournalcountryeditionlanguage
2005-05-04
10.1103/physrevb.72.081103http://arxiv.org/abs/cond-mat/0505106