Diamagnetic Susceptibility of the Infinity-U Hubbard-Model

Andrew Schofield, JM Wheatley, T Xiang

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The diamagnetic susceptibility of the infinity-U Hubbard model is investigated in one and two dimensions. In one dimension, it is shown that the charge current flowing in the ground state of a ring threaded by a flux tube vanishes in the thermodynamic limit. Similar behavior is inferred for the single-hole problem on a two-dimensional square lattice, from exact-diagonalization results on small clusters. Effectively the applied field is canceled by an induced fictitious field and the susceptibility vanishes. Our results suggest that the Nagaoka ferromagnet is unstable with respect to a low-spin state, level crossing to a chiral spin state occurring at infinitesimally small diamagnetic coupling.
Original languageEnglish
Pages (from-to)8349-8352
Number of pages4
JournalPhysical Review B
Volume44
Issue number15
DOIs
Publication statusPublished - 15 Oct 1991

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