Continuous unitary transformation approach to pairing interactions in statistical physics
We apply the flow equation method to the study of the fermion systems with pairing interactions which lead to the BCS instability signalled by the appearance of the off-diagonal order parameter. For this purpose we rederive the continuous Bogoliubov transformation in a fashion of renormalization g...
Збережено в:
| Видавець: | Інститут фізики конденсованих систем НАН України |
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| Дата: | 2008 |
| Автор: | |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
Інститут фізики конденсованих систем НАН України
2008
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| Назва видання: | Condensed Matter Physics |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/119045 |
| Теги: |
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| Цитувати: | Continuous unitary transformation approach to pairing interactions in statistical physics / T. Domański // Condensed Matter Physics. — 2008. — Т. 11, № 2(54). — С. 195-207. — Бібліогр.: 25 назв. — англ. |
Репозиторії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Резюме: | We apply the flow equation method to the study of the fermion systems with pairing interactions which lead
to the BCS instability signalled by the appearance of the off-diagonal order parameter. For this purpose we
rederive the continuous Bogoliubov transformation in a fashion of renormalization group procedure where the
low and high energy sectors are treated subsequently. We further generalize this procedure to the case of
fermions interacting with the discrete boson mode. Andreev-type interactions are responsible for developing
a gap in the excitation spectrum. However, the long-range coherence is destroyed due to strong quantum
fluctuations. |
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