Abstract
The density, spin, and isospin correlation functions in nuclear matter with a neutron-proton condensate are calculated to study the possible signatures of the BEC-BCS crossover in the low-density region. It is shown that the criterion of the crossover (Phys. Rev. Lett. 95, 090402 (2005)), 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. The presence (BCS regime) or absence (BEC regime) of the singularity in the momentum distribution of the quasiparticle density of states can be used as an unambiguous signature of the BEC-BCS transition.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
A. L. Goodman, Phys. Rev. C 60, 014311 (1999).
M. Baldo, U. Lombardo, and P. Schuck, Phys. Rev. C 52, 45 (1995).
B. K.-L. Kratz, J.-P. Bitouzet, F.-K. Thielmann, et al., Astrophys. J. 403, 216 (1993).
G. E. Brown and H. A. Bethe, Astrophys. J. 423, 659 (1994).
T. Alm, B. L. Friman, G. Röpke, et al., Nucl. Phys. A 551, 45 (1993).
A. Sedrakian and U. Lombardo, Phys. Rev. Lett. 84, 602 (2000).
A. I. Akhiezer, A. A. Isayev, S. V. Peletminsky, et al., Phys. Rev. C 63, 021304 (2001).
L. V. Keldysh and Yu. V. Kopaev, Sov. Phys. Solid State 6, 2219 (1965).
P. Nozieres and S. Schmitt-Rink, J. Low Temp. Phys. 59, 195 (1985).
U. Lombardo, P. Nozieres, P. Schuck, et al., Phys. Rev. C 64, 064314 (2001).
A. A. Isayev, S. I. Bastrukov, and J. Yang, Nucl. Phys. A 734, E112 (2004); Phys. At. Nucl. 67, 1840 (2004).
M. W. Zwierlein, C. A. Stan, C. H. Schunck, et al., Phys. Rev. Lett. 92, 120403 (2004).
J. Kinast, S. L. Hemmer, M. E. Gehm, et al., Phys. Rev. Lett. 92, 150402 (2004).
B. Mihaila, S. Gaudio, K. B. Blagoev, et al., Phys. Rev. Lett. 95, 090402 (2005).
L. D. Landau and E. M. Lifshitz, Course of Theoretical Physics, Vol. 5: Statistical Physics, 3rd ed. (Nauka, Moscow, 1976; Pergamon, Oxford, 1980), Part 1.
E. Garrido, P. Sarriguren, E. Moya de Guerra, et al., Phys. Rev. C 63, 037304 (2001).
M. Parish, B. Mihaila, E. M. Timmermans, et al., Phys. Rev. B 71, 064513 (2005).
Author information
Authors and Affiliations
Additional information
From Pis’ma v Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 82, No. 9, 2005, pp. 627–632.
Original English Text Copyright © 2005 by Isayev.
The text was submitted by the author in English.