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Density-matrix functionals for pairing in mesoscopic superconductors

Abstract : A functional theory based on single-particle occupation numbers is developed for pairing. This functional, that generalizes the Bardeen-Cooper-Schrieffer approach, directly incorporates corrections due to particle number conservation. The functional is benchmarked with the pairing Hamiltonian and reproduces perfectly the energy for any particle number and coupling.
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Contributor : Michel Lion <>
Submitted on : Tuesday, March 16, 2010 - 11:29:38 AM
Last modification on : Wednesday, February 17, 2021 - 3:26:05 PM

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David Lacroix, G. Hupin. Density-matrix functionals for pairing in mesoscopic superconductors. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2010, 82, pp.144509. ⟨10.1103/PhysRevB.82.144509⟩. ⟨in2p3-00464174⟩



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