Ferromagnetism in a hard-core boson model

被引：0
作者：
A. Fledderjohann
A. Langari
E. Müller-Hartmann
K.-H. Mütter
机构：
[1] University of Wuppertal,Physics Department
[2] Institute for Advanced Studies in Basic Sciences,Physics Department
[3] University of Cologne,undefined
来源：
The European Physical Journal B - Condensed Matter and Complex Systems | 2005年 / 43卷
关键词：
Spectroscopy; Neural Network; State Physics; Complex System; Nonlinear Dynamics;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The problem of ferromagnetism – associated with a ground state with maximal total spin – is discussed in the framework of a hard-core model, which forbids the occupancy at each site with more than one particle. It is shown that the emergence of ferromagnetism on finite square lattices crucially depends on the statistics of the particles. Fermions (electrons) lead to the well-known instabilities for finite hole densities, whereas for bosons (with spin) ferromagnetism appears to be stable for all hole densities.
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页码：471 / 478
页数：7
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