Persistent current noise in normal and superconducting nanorings

Abstract

We investigate fluctuations of persistent current (PC) in nanorings both with and without dissipation and decoherence. We demonstrate that such PC fluctuations may persist down to zero temperature provided there exists either interaction with an external environment or an external (periodic) potential produced, e.g., by quantum phase slips in superconducting nanorings. Provided quantum coherence is maintained in the system PC noise remains coherent and can be tuned by an external magnetic flux ${\Phi }_x$ piercing the ring. If quantum coherence gets suppressed by interactions with a dissipative bath PC noise becomes incoherent and ${\Phi }_x$-independent.

arXiv comment8 pages, 3 figures. Invited talk at FQMT'11

References in corpus (24)

• Mesoscopic quantum transport: Resonant tunneling in the presence of strong Coulomb interaction
• Superconductivity in one dimension
• Reply to the Comment on 'Quantum Phase Slips and Transport in Ultra-Thin Superconducting Wires'
• Quantum Tunneling of the Order Parameter in Superconducting Nanowires
• Quantum Decoherence in Disordered Mesoscopic Systems
• Coulomb Interaction and Quantum Transport through a Coherent Scatterer
• Zero-Point Fluctuations and the Quenching of the Persistent Current in Normal Metal Rings
• Quantum Coherence of the Ground State of a Mesoscopic Ring
• Strong Charge Fluctuations in the Single-Electron Box: A Quantum Monte Carlo Analysis
• Interaction and Quantum Decoherence
• Aharonov-Bohm oscillations of a particle coupled to dissipative environments
• Strong Tunneling and Coulomb Blockade in a Single-Electron Transistor
• Interactions and Weak Localization: Perturbation Theory and Beyond
• Interaction-Induced Quantum Dephasing in Mesoscopic Rings
• Quantum decoherence of interacting electrons in arrays of quantum dots and diffusive conductors
• Strong Electron Tunneling through a Small Metallic Grain
• Interference in presence of Dissipation
• Weak localization in a system with a barrier: Dephasing and weak Coulomb blockade
• Particle renormalizations in presence of dissipative environments
• Persistent current noise and electron-electron interactions
• Decoherence of a particle in a ring
• Persistent currents in nanorings and quantum decoherence by Coulomb interaction
• Dephasing of a particle in a dissipative environment
• Persistent current noise

Cited by in corpus (1)

• Persistent currents in quantum phase slip rings