Density, spin and isospin correlations in low-density two-component Fermi superfluid
Vernadsky National Library of Ukraine
Переглянути архів Інформація| Поле | Співвідношення | |
| Title |
Density, spin and isospin correlations in low-density two-component Fermi superfluid
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| Creator |
Isayev, A.A.
Yang, J. |
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| Subject |
Квантовые жидкости и квантовые кpисталлы
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| Description |
Finding the distinct features of the crossover from the regime of large overlapping Cooper pairs to the limit of non-overlapping pairs of fermions (Shafroth pairs) in multi-component Fermi systems remains a topical problem in a quantum many-body theory. Here this transition is studied by calculating the two-body density, spin and isospin correlation functions in dilute two-component Fermi superfluid, taking as an example an infinite system of protons and neutrons (nuclear matter). It is shown that criterion of the crossover (Phys. Rev. Lett. 95, 090402 (2005)), formulated for ultracold fermionic atomic gases and consisting in the change of the sign of the density correlation function at low momentum transfer, fails to describe correctly the density-driven BEC–BCS transition at finite isospin asymmetry or finite temperature. As an unambiguous signature of the BEC–BCS transition, one can use the presence (BCS regime) or absence (BEC regime) of the singularity in the momentum distribution of the quasiparticle density of states. |
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| Date |
2017-06-12T13:55:56Z
2017-06-12T13:55:56Z 2006 |
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| Type |
Article
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| Identifier |
Density, spin and isospin correlations in low-density
two-component Fermi superfluid / A.A. Isayev, J. Yang // Физика низких температур. — 2006. — Т. 32, № 10. — С. 1195–1202. — Бібліогр.: 22 назв. — англ.
0132-6414 PACS: 21.65.+f, 21.30.Fe, 71.10.Ay http://dspace.nbuv.gov.ua/handle/123456789/120616 |
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| Language |
en
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| Relation |
Физика низких температур
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| Publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
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