Study of linear response in Hubbard chains using Many-body Perturbation Theory
In this work the basic formalism of non-equilibrium Green’s functions is presented and then applied to study a Ward identity in linear response theory, namely the frequency sum-rule. It can be proven that the frequency sum-rule is satisfied when the quantities involved are calculated using perturbat...
| Main Author: | |
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| Other Authors: | , , , , , |
| Format: | Master's thesis |
| Language: | eng |
| Published: |
2010
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| Subjects: | |
| Online Access: | https://jyx.jyu.fi/handle/123456789/26598 |