The partition function of quantum spin systems is represented by a functional integral over "time"-dependent magnetic fields. It is evaluated in the saddle-point approximation. In this way, the excitations of the system are derived from first principles, and their interactions are obtained. ## 1. I
โฆ LIBER โฆ
Functional integral methods for stochastic fields
โ Scribed by F. Langouche; D. Roekaerts; E. Tirapegui
- Publisher
- Elsevier Science
- Year
- 1979
- Tongue
- English
- Weight
- 965 KB
- Volume
- 95
- Category
- Article
- ISSN
- 0378-4371
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