Exact diagonalization study of the Hubbard-parametrized four-spin ring exchange model on a square lattice

We have used exact numerical diagonalization to study the excitation spectrum and the dynamic spin correlations in the s = 1/2 next-next-nearest-neighbor Heisenberg antiferromagnet on the square lattice, with additional four-spin ring exchange from higher-order terms in the Hubbard expansion. We hav...

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Veröffentlicht in:	Physical review. B 2019-02, Vol.99 (5), p.054432, Article 054432
Hauptverfasser:	Larsen, C. B., Rømer, A. T., Janas, S., Treue, F., Mønsted, B., Shaik, N. E., Rønnow, H. M., Lefmann, K.
Format:	Artikel
Sprache:	eng
Schlagworte:	Antiferromagnetism Critical point Exchanging Excitation spectra Mathematical models Parameterization Parameters Phase transitions Q values Quantum phenomena Spin dynamics
Online-Zugang:	Volltext
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