Comparison of the π and Δ operator approximations for the two-dimensional t-J model

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作者：
Park, Youngho [1 ]
机构：
[1] Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan
来源：
Physics Letters, Section A: General, Atomic and Solid State Physics | 1999年 / 262卷 / 01期
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摘要：
We compare the spectra of the new π operator of the SO(5) theory and the conventional Δ operator for the two-dimensional t-J model. We also calculate the weight transferred to the two-hole ground state from half-filling by these operators. We find that the spectra of these operators are quite similar and the weight for the π operator is smaller than the weight for the Δ operator. We argue that the two-dimensional t-J model does not have a good approximate SO(S) symmetry claimed in Ref. [1]. © 1999 Published by Elsevier Science B.V. All rights reserved.
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页码：61 / 65
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