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Density, spin, and isospin correlations in low-density two-component Fermi superfluid

Title
Density, spin, and isospin correlations in low-density two-component Fermi superfluid
Authors
Isayev A.A.Yang J.
Ewha Authors
양종만
SCOPUS Author ID
양종만scopus
Issue Date
2006
Journal Title
Low Temperature Physics
ISSN
1063-777XJCR Link
Citation
vol. 32, no. 10, pp. 906 - 912
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
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. © 2006 American Institute of Physics.
DOI
10.1063/1.2364477
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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