120 citations · 406 across the 6 of their papers we have counts for
6 papers
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…
Exact Study of the Effect of Level Statistics in Ultrasmall Superconducting Grains
G. Sierra, J. Dukelsky, G. G. Dussel +2
The reduced BCS model that is commonly used for ultrasmall superconducting grains has an exact solution worked out long ago by Richardson in the context of nuclear physics. We use…
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…
Fixed-N Superconductivity: The Crossover from the Bulk to the Few-Electron Limit
Fabian Braun, Jan von Delft
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…
Superconductivity in Ultrasmall Metallic Grains
Fabian Braun, Jan von Delft
We develop a theory of superconductivity in ultrasmall (nm-scale) metallic grains having a discrete electronic eigenspectrum with a mean level spacing of order of the bulk gap. The…
Paramagnetic Breakdown of Superconductivity in Ultrasmall Metallic Grains
Fabian Braun, Jan von Delft, D. C. Ralph +1
We study the magnetic-field-induced breakdown of superconductivity in nm-scale metal grains having a mean electron level spacing (bulk gap). Using a generalized…