Relationship between the noise-induced persistent current and the dephasing rate
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 conn...
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| Published in | Physical review letters Vol. 84; no. 15; p. 3394 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
United States
10.04.2000
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| Online Access | Get more information |
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| Summary: | 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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| ISSN: | 1079-7114 |
| DOI: | 10.1103/physrevlett.84.3394 |