The Short Range RVB State of Even Spin Ladders: A Recurrent Variational Approach

Дата и время публикации : 1997-04-25T14:22:10Z

Авторы публикации и институты :
German Sierra
Miguel A. Martin-Delgado

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: REVTEX file, 32 pages, 10 EPS figures inserted in text with epsf.sty
Первичная категория: cond-mat

Все категории : cond-mat, hep-th

Краткий обзор статьи: Using a recursive method we construct dimer and nondimer variational ansatzs of the ground state for the two-legged ladder, and compute the number of dimer coverings, the energy density and the spin correlation functions. The number of dimer coverings are given by the Fibonacci numbers for the dimer-RVB state and their generalization for the nondimer ones. Our method relies on the recurrent relations satisfied by the overlaps of the states with different lengths, which can be solved using generating functions. The recurrent relation method is applicable to other short range systems. Based on our results we make a conjecture about the bond amplitudes of the 2-leg ladder.

Category: Physics