Ground state of a mobile vacancy in a quantum antiferromagnet: Small-cluster study

Veit Elser, David A. Huse, Boris I. Shraiman, Eric D. Siggia

Research output: Contribution to journalArticle

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Abstract

The ground state of a mobile vacancy in a square-lattice spin-1/2 Heisenberg antiferromagnet described by the t-J Hamiltonian is investigated numerically for an 18-site cluster. The ground state has spin 1/2, and the bottom of the vacancy band is at momentum k=(/2,/2), for t/J<4, which is consistent with the spin-wave perturbation theory. The structure of the spin configuration in the vicinity of the vacancy is examined using a number of correlation functions. The latter reveal the existence of a dipolar distortion of the staggered magnetization, as suggested by the semiclassical theory.

Original languageEnglish (US)
Pages (from-to)6715-6723
Number of pages9
JournalPhysical Review B
Volume41
Issue number10
DOIs
StatePublished - Jan 1 1990
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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