Restoration of symmetry in the spectrum of the bilayer Heisenberg antiferromagnet

The longitudinal mode in the Heisenberg model on a bilayer square lattice is studied using series expansion methods. It is demonstrated numerically that the longitudinal mode becomes degenerate with the magnon modes at the quantum phase transition between Neel and dimerized phases, thus forming a sp...

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Veröffentlicht in:	Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2012-01, Vol.85 (1), p.014432-014432, Article 014432
Hauptverfasser:	Hamer, C. J., Oitmaa, J., Weihong, Zheng
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter Critical point Lattice vibration Magnons Mathematical models Phase transformations Restoration Spin waves Symmetry
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description	The longitudinal mode in the Heisenberg model on a bilayer square lattice is studied using series expansion methods. It is demonstrated numerically that the longitudinal mode becomes degenerate with the magnon modes at the quantum phase transition between Neel and dimerized phases, thus forming a spin-1 multiplet, in accord with the restoration of SU(2) symmetry. Finally, it is shown that the magnon mode becomes degenerate with the triplet mode in the dimerized phase at the critical point, showing continuity of the excitation spectrum across the critical point.
doi_str_mv	10.1103/PhysRevB.85.014432
format	Article
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subjects	Condensed matter Critical point Lattice vibration Magnons Mathematical models Phase transformations Restoration Spin waves Symmetry
title	Restoration of symmetry in the spectrum of the bilayer Heisenberg antiferromagnet
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