Fluctuations of persistent current

Details Fluctuations of persistent current Fluctuations of persistent current

2010-02-16

arxiv.org/abs/1002.3104v2

J. Phys. Cond. Mat. 22 (2010) 485302

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 3 figure

Scientific paper

10.1088/0953-8984/22/48/485302

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.

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