Pair-mixing superconducting correlation in ultrasmall metallic grains

Guang Shan Tian, Lei Han TANG, Qing Hu Chen

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


The superconducting order in an ultrasmall metallic grain with a fixed number of electrons is analyzed. By exploiting the intrinsic symmetries of the BCS Hamiltonian, we establish some general properties of a recently proposed pair-mixing correlation function on a mathematically rigorous basis. We also prove a relation between this function and the conventional off-diagonal correlation function. By variationally estimating both correlation functions, we show that the superconducting crossover in ultrasmall, metallic grains is smooth, a conclusion reached previously by numerical calculations.

Original languageEnglish
Article number054511
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number5
Publication statusPublished - 10 Jan 2001

Scopus Subject Areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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