Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-08-16
Eur. Phys. J. - Special Topics 187 5 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
The work dedicated to Prof. Lutz Schimansky-Geier on the occasion of his 60th birthday
Scientific paper
10.1140/epjst/e2010-01265-4
In normal mesoscopic metals of a ring topology persistent currents can be induced by threading the center of the ring with a magnetic flux. This phenomenon is an example of the famous Aharonov-Bohm effect. In the paper we study the current {\it vs} the external constant magnetic flux characteristics of the system driven by both the classical and the quantum thermal fluctuations. The problem is formulated in terms of Langevin equations in classical and quantum Smoluchowski regimes. We analyze the impact of the quantum thermal fluctuations on the current-flux characteristics. We demonstrate that the current response can be changed from paramagnetic to diamagnetic when the quantum nature of the thermal fluctuations increases.
Machura Lukasz
Rogozinski Szymon
\Luczka Jerzy
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