Thesis
Problems in the quantum theory of many-particle systems
- Abstract:
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A finite temperature perturbation theory for the Heisenberg model of ferromagnetism is presented. A modified Wick's theorem proved for S=½ and finite temperatures allows the terms in the expansion for the temperature dependent Green's function to be expressed by linked Feynman-like diagrams. The diagrams differ from the usual boson and fermion diagrams in the appearance of time (temperature) dependent dotted lines between prop...
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- Peer review status:
- Peer Reviewed
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Authors
Funding
This thesis was digitised thanks to the generosity of Dr Leonard Polonsky
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Bibliographic Details
- Publication date:
- 1966
- Type of award:
- DPhil
- Level of award:
- Doctoral
- Awarding institution:
- University of Oxford
- Local pid:
- polonsky:11:6
Terms of use
- Copyright holder:
- Lewis, William W.
- Copyright date:
- 1966
- Notes:
- This thesis was digitised thanks to the generosity of Dr Leonard Polonsky
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