期刊
PHYSICAL REVIEW LETTERS
卷 87, 期 16, 页码 art. no.-167204出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.87.167204
关键词
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Spectral densities are computed in unprecedented detail for quantum anti ferromagnetic 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.
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