Ground states of infinite-range spin-(1/2 quantum Heisenberg antiferromagnets

Christopher Mudry, Eduardo Fradkin

Research output: Contribution to journalArticlepeer-review

Abstract

We study a class of infinite-range spin-(1/2 quantum Heisenberg antiferromagnets. We show that, in addition to ground states with macroscopic net spin in one or several sublattices (Néel states), there are valence-bond (VB) states that are local spin singlets. We show that there is a class of perturbations that stabilizes the VB state. We characterize the excitation spectrum and find an order parameter for the VB states. Finally, we extend our method to find perturbations that stabilize microscopic as well as macroscopic chiral states.

Original languageEnglish (US)
Pages (from-to)11177-11184
Number of pages8
JournalPhysical Review B
Volume40
Issue number16
DOIs
StatePublished - 1989

ASJC Scopus subject areas

  • Condensed Matter Physics

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