Persistent current noise and electron-electron interactions

Abstract

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.

12 pages, 8 figures

References in corpus (10)

• Quantum decoherence of interacting electrons in arrays of quantum dots and diffusive conductors
• Ground State Entanglement Energetics
• Interference in presence of Dissipation
• Weak localization in a system with a barrier: Dephasing and weak Coulomb blockade
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• Persistent currents in nanorings and quantum decoherence by Coulomb interaction
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• Persistent current noise

Cited by in corpus (6)

• Persistent currents in quantum phase slip rings
• Current Correlations in a Quantum Dot Ring: A Role of Quantum Interference
• Full counting statistics of persistent current
• On the macroscopic quantization in mesoscopic rings and single-electron devices
• Persistent current noise in normal and superconducting nanorings
• Detection of persistent current correlation in cavity-QED