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Stochastic fluctuations of persistent currents in mesoscopic rings
Author(s) -
Eckern Ulrich,
Schmid Albert
Publication year - 1993
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.19935050209
Subject(s) - mesoscopic physics , persistent current , physics , coulomb , condensed matter physics , current (fluid) , scattering , flux (metallurgy) , statistical physics , impurity , magnetic flux , quantum mechanics , superconductivity , materials science , magnetic field , electron , metallurgy , thermodynamics
We investigate systematically the effect of the electronic Coulomb interaction on the stochastic fluctuations (from sample to sample) in the persistent currents I (Φ) of mesoscopic rings threaded by a magnetic flux Φ. In contrast to our recent publication [Europhys. Lett. 18 (1992) 457], we avoid separation of impurity and interaction scattering events and we present here a comprehensive view. By this alternative procedure, we are able to confirm our earlier result, namely that 〈 I 2 〉 1/2 ∼ ev F / L , which is a much larger quantity than the average current 〈 I 〉 ∼ ev F l / L 2 .
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