Calculation of the singlet-triplet gap of the antiferromagnetic Heisenberg model on a ladder

M. Azzouz, Liang Chen, S. Moukouri

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

The ground-state energy and the singlet-triplet energy gap of the antiferromagnetic Heisenberg model on a ladder is investigated using a mean-field theory and the density-matrix renormalization group. Spin-wave theory shows that the corrections to the local magnetization are infinite. This indicates that no long-range order occurs in this system. A flux-phase state is used to calculate the energy gap as a function of the transverse coupling, J, in the ladder. It is found that the gap is linear in J for J1 and goes to zero for J→0. The mean-field theory agrees well with the numerical results.

Original languageEnglish
Pages (from-to)6233-6237
Number of pages5
JournalPhysical Review B
Volume50
Issue number9
DOIs
StatePublished - 1 Jan 1994
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

Fingerprint

Dive into the research topics of 'Calculation of the singlet-triplet gap of the antiferromagnetic Heisenberg model on a ladder'. Together they form a unique fingerprint.

Cite this