| Comprehensive theory for reduction of products of spin operators | |
| Wang, Huai-Yu | |
| 2010-10-12 ; 2010-10-12 | |
| 关键词 | Reduction of products of spin operators Heisenberg model Single-ion anisotropy Green's function method THIN FERROMAGNETIC-FILMS GREENS-FUNCTION THEORY MAGNETIC REORIENTATION ANISOTROPY FIELD Physics, Multidisciplinary |
| 中文摘要 | We present a comprehensive theory that reduces the total power of products of spin operators. This theory improves the previous one [P.J. Jensen, F. Aguilera-Granja, Phys. Lett. A 269 (2000) 158] in two aspects. One is that for the set of spin operators S+, S-, S-z, a new method is suggested where the expansion coefficients in the reduction formula can be solved from linear equations. This new method is of direct physical meaning and is easier to handle. The other is that we show a method to reduce the products of another set of spin operators S-x, S-y, S-z. For this set of operators, the use of permutation regulation of x -> y, y -> z and z -> x can save much time in obtaining some reduction formula. The present comprehensive theory enables one to deal more easily with the decoupling problems in Green' function theory where the set of either S+, S-, S-z or S-x, S-y, S-z operators is used. (C) 2009 Elsevier B.V. All rights reserved. |
| 语种 | 英语 ; 英语 |
| 出版者 | ELSEVIER SCIENCE BV ; AMSTERDAM ; PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS |
| 内容类型 | 期刊论文 |
| 源URL | [http://hdl.handle.net/123456789/81435]  |
| 专题 | 清华大学 |
| 推荐引用方式 GB/T 7714 | Wang, Huai-Yu. Comprehensive theory for reduction of products of spin operators[J],2010, 2010. |
| APA | Wang, Huai-Yu.(2010).Comprehensive theory for reduction of products of spin operators.. |
| MLA | Wang, Huai-Yu."Comprehensive theory for reduction of products of spin operators".(2010). |
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