2 papers
cond-mat.str-el1999
Superconductivity in Ultrasmall Grains: Introduction to Richardson's Exact Solution
Jan von Delft, Fabian Braun
Studies of pairing correlations in ultrasmall metallic grains have commonly been based on a simple reduced BCS-model describing the scattering of pairs of electrons between discret…
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…