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 discrete energy levels that come in time-reversed pairs. This model has an exact solution, worked out by Richardson in the context of nuclear physics in the 1960s. Here we give a tutorial introduction to his solution, and use it to check the quality of various previous treatments of this model.
CITATION STYLE
Delft, J., & Braun, F. (2000). Superconductivity in Ultrasmall Grains: Introduction to Richardson’s Exact Solution. In Quantum Mesoscopic Phenomena and Mesoscopic Devices in Microelectronics (pp. 361–370). Springer Netherlands. https://doi.org/10.1007/978-94-011-4327-1_24
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