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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2004     Display Documents



  history
ID: 192828.0, MPI für Festkörperforschung / FKF Publikationen 2004
On the nature of the magnetic transition in a Mott insulator
Authors:Fleck, M.; Lichtenstein, A. I.; Zacher, M. G.; Hanke, W.; Oleś, A. M.
Language:English
Date of Publication (YYYY-MM-DD):2004
Title of Journal:The European Physical Journal B
Volume:37
Issue / Number:4
Start Page:439
End Page:446
Review Status:not specified
Audience:Not Specified
Abstract / Description:Using a combination of exact enumeration and the dynamical mean-field
theory (DMFT) we study the drastic change of the spectral properties,
obtained in the half-filled two-dimensional Hubbard model at a
transition from an antiferromagnetic to a paramagnetic Mott insulator,
and compare it with the results obtained using the quantum Monte Carlo
method. The coherent hole (electron) quasiparticle spin-polaron
subbands are gradually smeared out when the AF order disappears, either
for increasing Coulomb repulsion U at fixed temperature T, or for
increasing T at fixed U. Within the DMFT we present numerical evidence
(a continuous disappearence of the order parameter) suggesting that the
above magnetic transition is second order both in two and in three
dimensions.
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany.
; Univ Nijmegen, NL-6525 ED Nijmegen, Netherlands.
; Univ Wurzburg, Inst Theoret Phys & Astrophys, D-97074 Wurzburg, Germany.
; Jagiellonian Univ, Marian Smoluchowski Inst Phys, PL-30059 Krakow, Poland.
Identifiers:ISI:000220821400005 [ID No:1]
ISSN:1434-6028 [ID No:2]
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