Excitation Spectrum for Quantum Spin Systems with Ladder, Plaquette and Mixed-Spin Structures

Details Excitation Spectrum for Quantum Spin Systems with Ladder, Plaquette and Mixed-Spin Structures Excitation Spectrum for Quantum Spin Systems with Ladder, Plaquette and Mixed-Spin Structures

1999-08-31

arxiv.org/abs/cond-mat/9908458v1

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, submitted to Phys. Rev. B

Scientific paper

By using the series expansion techniques, we study the excitation spectrum for the two-dimensional quantum spin systems with ladder, plaquette and mixed-spin structures. We calculate the spin excitation gap and thus determine the phase boundary between the spin-gap phase and the magnetically ordered phase rather precisely. It is found that the phase diagram obtained improves fairly well the one previously obtained via the ground-state susceptibility.

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