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29 March 2024
 
  » pubmed » pmid11019098

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Relationship between the noise-induced persistent current and the dephasing rate
V E Kravtsov ; B L Altshuler ;
Date 10 Apr 2000
Journal Phys Rev Lett, 84 (15), 3394-7
Abstractac noise in disordered conductors causes both dephasing of the electron wave functions and a dc current around a mesoscopic ring. We demonstrate that the dephasing rate tau(-1)(varphi) in long wires and the dc current <I>, induced by the same noise and averaged over an ensemble of small rings, are connected in a remarkably simple way: <I>tau(varphi) = C(beta)e. Here e is an electron charge, and the constant C(beta) approximately 1 depends on the Dyson symmetry class. The relationship seems to agree reasonably with experiments. This suggests that the two puzzles, anomalously large persistent current and the low-temperature saturation of the dephasing, may have a common solution.
Source PubMed, pmid11019098
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