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Impurity Energy Level Within The Haldane Gap | | Wei Wang
; Shaojin Qin
; Zhong-Yi Lu
; Lu Yu
; Zhaobin Su
; | | Date: |
6 Sep 1995 | | Abstract: | An impurity bond $J{’}$ in a periodic 1D antiferromagnetic, spin 1 chain with exchange $J$ is considered. Using the numerical density matrix renormalization group method, we find an impurity energy level in the Haldane gap, corresponding to a bound state near the impurity bond. When $J{’}<J$ the level changes gradually from the edge of the Haldane gap to the ground state energy as the deviation $dev=(J-J{’})/J$ changes from 0 to 1. It seems that there is no threshold. Yet, there is a threshold when $J{’}>J$. The impurity level appears only when the deviation $dev=(J{’}-J)/J{’}$ is greater than $B_{c}$, which is near 0.3 in our calculation. | | Source: | arXiv, cond-mat/9509010 | | Services: | Forum | Review | PDF | Favorites | |
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