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cond-mat.supr-con2002
Two pairing parameters in superconducting grains
M. Schechter, J. von Delft, Y. Imry +1
Unlike bulk superconductivity, where one energy scale, the energy gap, characterizes pairing correlations, we show that in small superconducting grains there exist two different su…
cond-mat.supr-con1999
Fixed-N Superconductivity: The Exact Crossover from the Bulk to the Few-Electron Limit
Fabian Braun, Jan von Delft
We use two truly canonical approaches to describe superconductivity in ultrasmall metallic grains: (a) a variational fixed-N projected BCS-like theory and (b) an exact solution of…