The parity effect in an ultrasmall superconducting grain is examined. By applying a generalized version of Lieb’s spin-reflection positivity technique, we show rigorously that the parity parameter (Formula presented) is nonvanishing in such a system. A positive lower bound for (Formula presented) is derived.
|Number of pages||5|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 1998|
Scopus Subject Areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics