Pair-mixing superconducting correlation in ultrasmall metallic grains

Guang-Shan Tian, Lei-Han Tang, Qing-Hu Chen

Research output: Contribution to journalJournal articlepeer-review

12 Citations (Scopus)
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Abstract

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
Number of pages10
JournalPhysical Review B
Volume63
Issue number5
Early online date10 Jan 2001
DOIs
Publication statusPublished - 1 Feb 2001

Scopus Subject Areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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