第5卷‧第2期,
198104
, pp. 119-124
修改之卡丹諾夫變分法在-維艾辛模型上之運用
- 作者:
劉叔平; 萬德深; RINSE研究小組
- 作者服務機構:
中正理工學院物理研究所
- 中文摘要:
在-維艾辛模型中,卡丹諾夫低限歸元群轉換,若用適當的變分參數,可以得到正確的結果。本文解出-維艾辛模型
(包括自旋?及自旋1系統)之最佳變分參數。由這些實際解出的參數,可檢查修改之卡丹諾夫變分法的可靠性。我們發現
對自旋?系統在無外加磁場時,修改之卡丹講夫變分法非常可信,但對其他情況則不然。
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- 英文摘要:
Here it is shown that, for one dimensional Ising systems with or without external a magnetic field,the Kadanoff's lower bound renormalization group transformation may be exact if the optimum variationalparameters are derived. Such optimum variational parameters are used to check the reliability of an ap-proximate method, called modified Kadanoffs variational method, for determining the optimum variationalparameters. It was found that the modified Kadanoffs variational method is very reliable for the spin 1/2system, without external magentic field, and not reliable in other cases.
- 中文關鍵字:
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- 英文關鍵字:
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