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Fractional and integer excitations in quantum antiferromagnetic spin 1/2 ladders.

作者信息

Knetter C, Schmidt K P, Grüninger M, Uhrig G S

机构信息

Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany.

出版信息

Phys Rev Lett. 2001 Oct 15;87(16):167204. doi: 10.1103/PhysRevLett.87.167204. Epub 2001 Oct 1.

DOI:10.1103/PhysRevLett.87.167204
PMID:11690239
Abstract

Spectral densities are computed in unprecedented detail for quantum antiferromagnetic spin 1/2 two-leg ladders. These results were obtained due to a major methodical advance achieved by optimally chosen unitary transformations. The approach is based on dressed integer excitations. Considerable weight is found at high energies in the two-particle sector. Precursors of fractional spinon physics occur supporting the conclusion that there is no necessity to resort to fractional excitations in order to describe features at higher energies.

摘要

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