By means of the Lanczos method we analyze superconducting correlations in ultrasmall grains at fixed particle number. We compute the ground-state properties and the excitation Sap of the pairing Hamiltonian as a function of the level spacing delta, Both quantities turn out to be parity dependent and universal functions of the ratio delta/Delta (Delta is the BCS gap). We then characterize superconductivity in the canonical ensemble from the scaling behavior of correlation functions in energy space.
Titolo: | Small superconducting grain in the canonical ensemble |
Autori interni: | |
Data di pubblicazione: | 1998 |
Rivista: | |
Handle: | http://hdl.handle.net/20.500.11769/965 |
Appare nelle tipologie: | 1.1 Articolo in rivista |
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