Fractional and integer excitations in quantum antiferromagnetic spin 1/2 ladders -: art. no. 167204

被引：84
|
作者：
Knetter, C
Schmidt, KP
Grüninger, M
Uhrig, GS
机构：
[1] Univ Cologne, Inst Theoret Phys, D-50937 Cologne, Germany
[2] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany
来源：
PHYSICAL REVIEW LETTERS | 2001年 / 87卷 / 16期
关键词：
D O I：
10.1103/PhysRevLett.87.167204
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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.
引用
收藏
页码：art. no. / 167204
页数：4
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