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Condensed Matter > Superconductivity

arXiv:1512.07775 (cond-mat)
[Submitted on 24 Dec 2015]

Title:Basic variables to be reproduced in the first-principles theory for superconductors: Fluctuation of the particle number

Authors:Katsuhiko Higuchi, Masahiko Higuchi
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Abstract:We show that the diagonal elements of the second-order reduced density matrix (RDM2) can be chosen as basic variables for describing the superconducting state, instead of the off-diagonal elements of the RDM2 that are usually adopted as basic variables in the density functional scheme. The diagonal elements of the RDM2 are called pair-density (PD), which is explicitly related to the fluctuation of the particle number of the system. In this paper, we argue that the fluctuation of the particle number can become an indication of the superconducting state, and that the density functional scheme in which the PD is chosen as a basic variable would be a promising first-principles theory for superconductors.
Comments: no figure
Subjects: Superconductivity (cond-mat.supr-con)
Cite as: arXiv:1512.07775 [cond-mat.supr-con]
  (or arXiv:1512.07775v1 [cond-mat.supr-con] for this version)
  https://doi.org/10.48550/arXiv.1512.07775
Journal reference: J. Phys. Soc. Jpn. 86, 064704/1-11 (2017)
Related DOI: https://doi.org/10.7566/JPSJ.86.064704

Submission history

From: Katsuhiko Higuchi [view email]
[v1] Thu, 24 Dec 2015 10:10:25 UTC (23 KB)
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