Ground State of Antiferromagnetic Quantum Spin Systems on the Triangular Lattice

Takehiko Oguchi, Hidetoshi Nishimori, Yoshihiro Taguchi

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)

Abstract

The spin-1/2 antiferromagnetic Heisenberg and XY models are investigated on the triangular lattice by numerically diagonalizing finite size systems (up to 21 spins). The ground state energies of both models are found to be close to other theoretical predictions except those of Marland and Betts who performed similar analysis to ours. We have numerically constructed a resonating valence bond state of Anderson. It has a relatively large projection on the ground state of the finite Heisenberg model, although the absolute value of the projection decreases linearly with the system size. The trial function proposed by Miyashita for the XY model does not have an appreciable projection on the numerically exact state. We present evidence for the absence of a sublattice long range order in the Heisenberg model and the existence of the same quantity in the XY model.

Original languageEnglish
Pages (from-to)323-330
Number of pages8
Journaljournal of the physical society of japan
Volume55
Issue number1
DOIs
Publication statusPublished - 1986 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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