Ferromagnetism in an Itinerant Electron System
Ferromagnetism in an Itinerant Electron System作者机构:Institut de Physique Théorique Ecole Polytechnique Fédérale de Lausanne PHB-Ecublens CH-1015 Lausanne Switzerland
出 版 物:《Communications in Nonlinear Science and Numerical Simulation》 (非线性科学与数值模拟通讯(英文版))
年 卷 期:1996年第1卷第3期
页 面:12-16页
核心收录:
学科分类:07[理学] 0701[理学-数学] 070101[理学-基础数学]
基 金:Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung SNF
主 题:Ferromagnetism Hubbard model Kondo-lattice model
摘 要:In this work, the ground states of the Hubbard model on complete graph arestudied, for a finite lattice sise L and arbitrary on-site energy U. We construct explicitlythe ground states of the system when the number of the electrons Ne ≥ L + 1. In particular,for Ne = L + 1, the ground state is ferromagntic with total spin sg = (Ne - 2)/2.