| Autor: |
Milewski, Jan, Lulek, Barbara, Lulek, Tadeusz, Labuz, Miroslaw, Stagraczynski, Ryszard |
| Rok vydání: |
2014 |
| Předmět: |
|
| Zdroj: |
Physica B 434, 14-20, 2014 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1016/j.physb.2013.10.041 |
| Popis: |
The exact Bethe eigenfunctions for the heptagonal ring within the isotropic XXX model exhibit a doubly degenerated energy level in the three-deviation sector at the centre of the Brillouin zone. We demonstrate an explicit construction of these eigenfunctions by use of algebraic Bethe Ansatz, and point out a relation of degeneracy to parity conservation, applied to the configuration of strings for these eigenfunctions. Namely, the internal structure of the eigenfunctions (the 2-string and the 1-string, with opposite quasimomenta) admits generation of two mutually orthogonal eigenfunctions due to the fact that the strings which differ by their length are distinguishable objects. |
| Databáze: |
arXiv |
| Externí odkaz: |
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