Relationship between the noise-induced persistent current and the dephasing rate |
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Authors: | Kravtsov Altshuler |
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Institution: | The Abdus Salam International Centre for Theoretical Physics, P.O.B. 586, 34100 Trieste, Italy and Landau Institute for Theoretical Physics, 2 Kosygina Street, 117940 Moscow, Russia and and Centre for Advanced Study, Drammensveien 78, N-0271 Oslo, |
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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 , induced by the same noise and averaged over an ensemble of small rings, are connected in a remarkably simple way: 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. |
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