Breakdown of the Nagaoka phase in the two-dimensional t-J model

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In the limit of weak exchange J at low hole concentration δ the ground state of the two-dimensional t-J 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, Jcr∼t δ2, 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 8 and scales as a power of the system size N.

Original languageEnglish
Article number134437
Pages (from-to)1344371-1344377
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number13
StatePublished - 1 Apr 2002
Externally publishedYes

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