Breakdown of the Nagaoka phase in the two-dimensional (formula presented) model

E. Eisenberg, R. Berkovits, David A. Huse, B. L. Altshuler

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

In the limit of weak exchange J at low hole concentration (formula presented) the ground state of the two-dimensional (formula presented) model is believed to be ferromagnetic. We study the leading instability of this Nagaoka state, which emerges with increasing J. Both exact diagonalization of small clusters, and a semiclassical analytical calculation of larger systems show that above a certain critical value of the exchange, (formula presented) Nagaoka’s state is unstable to phase separation. In a finite-size system a bubble of antiferromagnetic Mott insulator appears in the ground state above this threshold. The size of this bubble depends on (formula presented) and scales as a power of the system size N.

Original languageEnglish (US)
Pages (from-to)1-7
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number13
DOIs
StatePublished - Jan 1 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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