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- W2129440450 abstract "We present a truly canonical theory of superconductivity in ultrasmall metallic grains by variationally optimizing fixed- $N$ projected BCS wave functions, which yields the first full description of the entire crossover from the bulk BCS regime (mean level spacing $densuremath{ll}mathrm{bulk}mathrm{gap}stackrel{ifmmode tilde{}else ~{}fi{}}{ensuremath{Delta}}$) to the ``fluctuation-dominated'' few-electron regime $(densuremath{gg}stackrel{ifmmode tilde{}else ~{}fi{}}{ensuremath{Delta}})$. A wave-function analysis shows in detail how the BCS limit is recovered for $densuremath{ll}stackrel{ifmmode tilde{}else ~{}fi{}}{ensuremath{Delta}}$, and how for $densuremath{gg}stackrel{ifmmode tilde{}else ~{}fi{}}{ensuremath{Delta}}$ pairing correlations become delocalized in energy space. An earlier grand-canonical prediction for an observable parity effect in the spectral gaps is found to survive the fixed- $N$ projection." @default.
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- W2129440450 date "1998-11-23" @default.
- W2129440450 modified "2023-09-25" @default.
- W2129440450 title "Fixed-<i>N</i>Superconductivity: The Crossover from the Bulk to the Few-Electron Limit" @default.
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- W2129440450 doi "https://doi.org/10.1103/physrevlett.81.4712" @default.
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