Thursday, July 4, 2013

1307.0609 (Sanjib Ghosh et al.)

Shell effect in strongly disordered superconductors    [PDF]

Sanjib Ghosh, Sudhansu S. Mandal
We show that the superconducting islands formed in strongly disordered superconductors are susceptible to exhibit shell-like effect, analogous to the same observed in superconducting nanoparticles. The shape and position of the islands appreciably change if the average electron density, $$, is tuned without changing the disorder landscape. Upon monotonic sweeping of $$, the spatial structure of the pair-amplitude passes through entirely different looking textures, sometime even noticeably less inhomogeneous structure. Both the spatially averaged pair-amplitude (SAPA) and quasiparticle excitation gap oscillates with $$. The correlation of SAPA with the mean level spacing of the low-lying quasiparticle eigenstates is explored. The experimental consequences are also discussed.
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