Fractional and integer excitations in quantum antiferromagnetic spin 1/2 ladders.
Phys Rev Lett
; 87(16): 167204, 2001 Oct 15.
Article
em En
| MEDLINE
| ID: mdl-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.
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Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2001
Tipo de documento:
Article