Nonlocal microscopic theory of quantum friction between parallel metallic slabs

Despoja, Vito and Echenique, Pedro M. and Šunjić, Marijan (2011) Nonlocal microscopic theory of quantum friction between parallel metallic slabs. Physical Review B, 83 (20). pp. 205424-10. ISSN 1098-0121

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We present a new derivation of the friction force between two metallic slabs moving with constant relative parallel velocity, based on T=0 quantum-field theory formalism. By including a fully nonlocal description of dynamically screened electron fluctuations in the slab, and avoiding the usual matching-condition procedure, we generalize previous expressions for the friction force, to which our results reduce in the local limit. Analyzing the friction force calculated in the two local models and in the nonlocal theory, we show that for physically relevant velocities local theories using the plasmon and Drude models of dielectric response are inappropriate to describe friction, which is due to excitation of low-energy electron-hole pairs, which are properly included in nonlocal theory. We also show that inclusion of dissipation in the nonlocal electronic response has negligible influence on friction.

Item Type: Article
Keywords: quantum friction, nonlocal response, Drude and plasmon models
Date: May 2011
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2011) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-1191458-1011
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 01 Jun 2014 13:03
Last Modified: 03 Jun 2014 12:02

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