Excitation hierarchy of the quantum sine-Gordon spin chain in strong magnetic field

Details Excitation hierarchy of the quantum sine-Gordon spin chain in strong magnetic field Excitation hierarchy of the quantum sine-Gordon spin chain in strong magnetic field

2004-03-15

arxiv.org/abs/cond-mat/0403364v1

Phys. Rev. Lett. 93, 027201 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

4 RevTeX pages, 3 figures

Scientific paper

10.1103/PhysRevLett.93.027201

The magnetic excitation spectrum of copper pyrimidine dinitrate, a material containing S=1/2 antiferromagnetic chains with alternating g-tensor and the Dzyaloshinskii-Moriya interaction, and exhibiting a field-induced spin gap, is probed using submillimeter wave electron spin resonance spectroscopy. Ten excitation modes are resolved in the low-temperature spectrum, and their frequency-field diagram is systematically studied in magnetic fields up to 25 T. The experimental data are sufficiently detailed to make a very accurate comparison with predictions based on the quantum sine-Gordon field theory. Signatures of three breather branches and a soliton, as well as those of several multi-particle excitation modes are identified.

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