Fluctuations of persistent current
arXiv:1002.3104 · doi:10.1088/0953-8984/22/48/485302
Abstract
We theoretically analyze equilibrium fluctuations of persistent current (PC) in nanorings. We demonstrate that these fluctuations persist down to zero temperature provided the current operator does not commute with the total Hamiltonian of the system. For a model of a quantum particle on a ring we explicitly evaluate PC noise power which has the form of sharp peaks at frequencies set by the corresponding interlevel distances. In rings with many conducting channels a much smoother and broader PC noise spectrum is expected. A specific feature of PC noise is that its spectrum can be tuned by an external magnetic flux indicating the presence of quantum coherence in the system.
12 pages, 3 figure
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Cited by in corpus (5)
- Persistent currents in quantum phase slip rings
- Current Correlations in a Quantum Dot Ring: A Role of Quantum Interference
- Persistent current noise and electron-electron interactions
- Full counting statistics of persistent current
- On the macroscopic quantization in mesoscopic rings and single-electron devices