Hole-hole correlations in the $U=infty $ limit of the Hubbard model and the stability of the Nagaoka state

Дата и время публикации : 1993-02-06T16:13:00Z

Авторы публикации и институты :
M. Long
X. Zotos

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 15 pages, REVTEX
Первичная категория: cond-mat

Все категории : cond-mat

Краткий обзор статьи: We use exact diagonalisation in order to study the infinite – $U$ limit of the two dimensional Hubbard model. As well as looking at single-particle correlations, such as $n_{{bf k}sigma }=langle c^dagger _{{bf k}sigma }c_{{bf k}sigma } rangle $, we also study {it N-particle correlation functions} which compare the relative positions of {it all} the particles in different models. In particular we study 16 and 18-site clusters and compare the charge correlations in the Hubbard model with those of spinless fermions and hard-core bosons. We find that although low densities of holes favour a `locally-ferromagnetic’ fermionic description, the correlations at larger densities resemble those of pure hard-core bosons surprisingly well .

Category: Physics