Coherent potential approximation for charge ordering in the extended Hubbard model
نویسندگان
چکیده
منابع مشابه
Extended Hubbard model: Charge ordering and Wigner-Mott transition
Strong correlations effects, which are often associated to the approach to a Mott insulating state, in some cases may be observed even far from half filling. This typically happens whenever the intersite Coulomb repulsion induces a tendency toward charge ordering, an effect that confines the electrons, and in turn favors local moment formation, i.e., Mott localization. A distinct intermediate r...
متن کاملCharge ordering and phase separation in the infinite dimensional extended Hubbard model
We study the extended Hubbard model with both on-site sUd and nearest neighbor sVd Coulomb repulsion using the exact diagonalization method within the dynamical mean field theory. For a fixed U sU=2.0d, the T-n phase diagrams are obtained for V=1.4 and V=1.2, at which the ground state of n=1/2 system is chargeordered and charge-disordered, respectively. In both cases, robust charge order is fou...
متن کاملEnhanced Spin Susceptibility toward the Charge-Ordering Transition in a Two-Dimensional Extended Hubbard Model
Based on the non-skeleton diagrammatic expansion satisfying the compressibility and spinsusceptibility sum rules, we investigate static charge and spin responses in a two-dimensional extended Hubbard model with the nearest-neighbor Coulomb repulsion in the vicinity of its charge-ordering transition point. In this expansion, we can calculate approximate charge and spin response functions by syst...
متن کاملCharge ordering and magnetism in quarter-filled Hubbard-Holstein model
Sanjeev Kumar1,2 and Jeroen van den Brink1,3 1Institute Lorentz for Theoretical Physics, Leiden University, P.O. Box 9506, 2300 RA Leiden, The Netherlands 2Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands 3Institute for Molecules and Materials, Radboud Universiteit Nijmegen, P.O. Box 9010, 6500 GL Nijmegen, The Netherlands Received 23 May ...
متن کاملReentrant Charge Order Transition in the Extended Hubbard Model
We study the extended Hubbard model with both on-site and nearest neighbor Coulomb repulsion (U and V , respectively) in the dynamical mean field theory. At quarter filling, the model shows a transition to a charge ordered phase with different sublattice occupancies nA fi nB. The effective mass increases drastically at the critical V and a pseudogap opens in the single-particle spectral functio...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Physics: Condensed Matter
سال: 2002
ISSN: 0953-8984
DOI: 10.1088/0953-8984/14/26/304