6533b7d0fe1ef96bd125ad6b

RESEARCH PRODUCT

Orbital-selective Mott transitions in the 2-band J_z-model: a high-precision quantum Monte Carlo study

N. BlümerC. KnechtP. G. J. Van Dongen

subject

PhysicsCondensed Matter::Quantum GasesWork (thermodynamics)Hubbard modelStrongly Correlated Electrons (cond-mat.str-el)Quantum Monte CarloDegenerate energy levelsOrder (ring theory)FOS: Physical sciencesCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsMott transitionCondensed Matter - Strongly Correlated ElectronsSelf-energyQuantum mechanicsCondensed Matter::Strongly Correlated ElectronsAnisotropy

description

Using high-precision quantum Monte Carlo (QMC) simulations within the framework of dynamical mean field theory (DMFT), we show that the anisotropic degenerate two-orbital Hubbard model contains two consecutive orbital-selective Mott transitions (OSMTs) even in the absence of spin-flip terms and pair-hopping processes. In order to reveal the second transition we carefully analyze the low-frequency part of the self-energy and the local spectral functions. This paper extends our previous work to lower temperatures. We discuss the nature - in particular the order - of both Mott transitions and list various possible extensions.

yearjournalcountryeditionlanguage
2005-07-28
10.1002/pssb.200562449http://arxiv.org/abs/cond-mat/0507682