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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 | Abstract: | ac 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 | Services: | Forum | Review | Favorites |
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