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Volumn 71, Issue 9, 2005, Pages

Popov approximation for composite bosons in the BCS-BEC crossover

Author keywords

[No Author keywords available]

Indexed keywords

ACCURACY; ARTICLE; BOSON; COMPOSITE MATERIAL; FERMION; THEORETICAL STUDY;

EID: 20344375910     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.71.094520     Document Type: Article
Times cited : (35)

References (47)
  • 9
    • 2842515744 scopus 로고
    • Phys. Rev. 124, 1866 (1961);
    • (1961) Phys. Rev. , vol.124 , pp. 1866
  • 24
    • 0001631917 scopus 로고
    • [Sov. Phys. JETP 13, 1018 (1961)].
    • (1961) Sov. Phys. JETP , vol.13 , pp. 1018
  • 31
    • 0040238192 scopus 로고
    • Modern Trends in the Theory of Condensed Matter, edited by A. Pekalski and R. Przystawa, Springer-Verlag, Berlin
    • A. J. Leggett, in Modern Trends in the Theory of Condensed Matter, edited by A. Pekalski and R. Przystawa, Lecture Notes in Physics Vol. 115 (Springer-Verlag, Berlin, 1980), p. 13.
    • (1980) Lecture Notes in Physics , vol.115 , pp. 13
    • Leggett, A.J.1
  • 32
    • 0041885326 scopus 로고    scopus 로고
    • Under suitable conditions, the Gross-Pitaevskii equation can be formally derived from the BCS smean-fieldd gap equation in the presence of an external potential [P. Pieri and G. C. Strinati, Phys. Rev. Lett. 91, 030401 (2003)].
    • (2003) Phys. Rev. Lett. , vol.91 , pp. 030401
    • Pieri, P.1    Strinati, G.C.2
  • 33
    • 20344378752 scopus 로고    scopus 로고
    • note
    • μ→ -∞ can thus be either separately or simultaneously applied, depending on the need.
  • 36
    • 33748957360 scopus 로고
    • G. Baym, Phys. Rev. 127, 1391 (1962).
    • (1962) Phys. Rev. , vol.127 , pp. 1391
    • Baym, G.1
  • 37
    • 20344373973 scopus 로고    scopus 로고
    • G. C. Strinati and P. Pieri, cond-mat/0406393
    • G. C. Strinati and P. Pieri, cond-mat/0406393.
  • 38
    • 20344404264 scopus 로고    scopus 로고
    • note
    • In the following we shall regard as irrelevant for all practical purposes the difference for the ratio r between the value 0.75 sobtained in Ref. 14d and the value 0.60 sobtained in Ref. 30 by solving the four-fermion problem exactlyd. A discussion about this difference will be given in Sec. IV.
  • 40
    • 0001518727 scopus 로고
    • Interaction diagrams between composite bosons of higher order than the sexchanged contribution (27) have been considered in nuclear-physics problems. See, e.g., P. F. Bortignon, R. A. Broglia, and D. R. Bes, Phys. Lett. 76B, 153 (1978).
    • (1978) Phys. Lett. , vol.76 B , pp. 153
    • Bortignon, P.F.1    Broglia, R.A.2    Bes, D.R.3
  • 44
    • 20344375525 scopus 로고    scopus 로고
    • M. J. Holland, C. Menotti, and L. Viverit, cond-mat/0404234
    • M. J. Holland, C. Menotti, and L. Viverit, cond-mat/0404234.
  • 46
    • 0043192452 scopus 로고    scopus 로고
    • The validity of the approximations for sid neglecting the wave vector and frequency dependence of the t matrix that enters the bosonic self-energy, and for siid replacing this t matrix by its value in vacuum, has been explicitly verified by a numerical calculation in the normal phase fcf. P. Pieri, G. C. Strinati, and I. Tifrea, Eur. Phys. J. B 22, 79 (2001d).
    • (2001) Eur. Phys. J. B , vol.22 , pp. 79
    • Pieri, P.1    Strinati, G.C.2    Tifrea, I.3
  • 47
    • 20344390081 scopus 로고    scopus 로고
    • note
    • 0(r) and n′(r) obtained within the Popov approximation do not coincide with those obtained within the Bogoliubov approximation.


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