Non-linear response and electron-electron interactions in mesoscopic metal rings |
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Authors: | P Kopietz A Völker |
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Institution: | Institut für Theoretische Physik der Universit?t G?ttingen, Bunsenstrasse 9, 37073, G?ttingen, Germany
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Abstract: | A time-dependent electric field gives rise to a stationary non-equilibrium current I
(2)
around a mesoscopic metal ring threaded by a magnetic flux. We show that this current, which is proportional to the intensity
of the field, is closely related to the exchange part of the interaction contribution to the equilibrium persistent current, and that the corresponding non-linear conductivity directly measures the weak localization correction
to the polarization. We explicitly calculate the disorder average of I
(2)
in the diffusive regime as function of the frequency of the electric field and the static flux piercing the ring, and suggest
an experiment to test our theory.
Received: 5 September 1997 / Accepted: 4 November 1997 |
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Keywords: | PACS 73 50 Bk General theory scattering mechanisms - 72 10 Bg General formulation of transport theory - 72 15 Rn Quantum localization |
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