Физика Низких Температур: Том 43, Выпуск 6 (Июнь 2017), c. 879-884    ( к оглавлению , назад )

Variable range hopping in thin film with large dielectric constant

B.I. Shklovskii

Theoretical Physics Institute, University of Minnesota, Minneapolis, Minnesota 55455, USA
E-mail: shklovsk@physics.umn.edu

Received August 5, 2016

Аннотация

In a film with large dielectric constant κ the electric field of an electron spreads inside the film before exiting the film at large distances of order of κd (d is the film width). This leads to the logarithmic Coulomb repulsion between electrons and modifies the shape of the Coulomb gap in the density of localized states in a doped film. As a result the variable range hopping conductivity in such a film has a peculiar temperature dependence, where the domain of the ln σ(T) ∝ (T0/T)p dependence, with the index p ≃ 0.7, is sandwiched between the two domainswith p = 1/2.

PACS: 74.81.Fa Josephson junction arrays and wire networks;
PACS: 05.60.Gg Quantum transport;
PACS: 74.81.Bd Granular, melt-textured, amorphous, and composite superconductors.

Ключевые слова: Coulomb gap, thin film, hopping conductivity.

Published online: April 25, 2017