Finite-size clusters in discrete Hubbard model with transverse and longitudinal magnetic fields

Document Type

Article

Publication Date

1-1-1999

Abstract

We study the finite-size effects and stability of the fully polarized ferromagnetic state against one spin-flip in the presence of a strong magnetic field (Zeeman coupling) in a finite Hubbard lattice for Id and 2d clusters of atoms. Periodic boundary conditions for electrons is assumed and we thread the system with a flux (Peierls phase) which is represented by a transverse magnetic field normal to the surface. The exact critical magnetic field for ferromagnetic saturation at half-filling depends on cluster size, intra-atomic interaction and transverse field. It is found that the excitation gap and the criteria for Mott-Hubbard localization in the high spin region for small systems in Id and 2d depend on lattice geometry, the number of atomic sites (parity) and Peierls phase. © 1999 Elsevier Science B.V. All rights reserved.

Identifier

9344264610 (Scopus)

Publication Title

Physica B Condensed Matter

External Full Text Location

https://doi.org/10.1016/S0921-4526(98)00918-1

ISSN

09214526

First Page

736

Last Page

738

Volume

259-261

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