Fractional and Integer Excitations in Quantum Antiferromagnetic Spin 1/2 Ladders

Details Fractional and Integer Excitations in Quantum Antiferromagnetic Spin 1/2 Ladders Fractional and Integer Excitations in Quantum Antiferromagnetic Spin 1/2 Ladders

2001-06-05

arxiv.org/abs/cond-mat/0106077v2

Phys. Rev. Lett. 87, 167204

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 4 figures included, minor text changes, improved figures

Scientific paper

10.1103/PhysRevLett.87.167204

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 implying that there is no necessity to resort to fractional excitations in order to describe features at higher energies.

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