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Persistent current noise and electron-electron interactions
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DOI：10.1103/PhysRevB.84.045416.png)
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We analyze fluctuations of persistent current (PC) produced by a charged quantum particle moving in a ring and interacting with a dissipative environment formed by diffusive electron gas. We demonstrate that in the presence of interactions such PC fluctuations persist down to zero temperature. In the case of weak interactions and/or sufficiently small values of the ring radius R PC noise remains coherent and can be tuned by external magnetic flux Phi(x) piercing the ring. In the opposite limit of strong interactions and/or large values of R fluctuations in the electronic bath strongly suppress quantum coherence of the particle down to T = 0 and induce incoherent Phi(x)-independent current noise in the ring, which persists even at Phi(x) = 0 when the average PC is absent.
Keyword:
NORMAL-METAL RINGS
ULTRASMALL TUNNEL-JUNCTIONS
QUANTUM DECOHERENCE
MESOSCOPIC RINGS
COULOMB-BLOCKADE
GROUND-STATE
CHARGE FLUCTUATIONS
WEAK-LOCALIZATION
DYNAMICS
SINGLE
期刊
IF:
3.7
论文数:
15.4W
被引数:
41.0W
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