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Spectral densities are computed in unprecedented detail for quantumantiferromagnetic spin 1/2 two-leg ladders. These results were obtained due toa major methodical advance achieved by optimally chosen unitarytransformations. 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 nonecessity to resort to fractional excitations in order to describe features athigher energies.Comment: 6 pages, 4 figures included, minor text changes, improved figure

physical review letters

Fractional and Integer Excitations in Quantum Antiferromagnetic Spin<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>1</mml:mn><mml:mi>/</mml:mi><mml:mn>2</mml:mn></mml:math>Ladders

Fractional and Integer Excitations in Quantum Antiferromagnetic Spin1/2Ladders