Влияние электрического поля на квантовые поправки к электропроводности углеродных материалов

Владимир Адамович Доросинец; Хо  Вьет

Authors

Vladimir A. Dorosinets Belarusian State University, Niezaliežnasci Avenue, 4, 220030, Minsk, Belarus
Ho Viet Belarusian State University, Niezaliežnasci Avenue, 4, 220030, Minsk, Belarus

Keywords:

сarbon, metal – insulator transition, quantum correction, weak localization, electron-electron interaction

Abstract

The electric field influence on quantum corrections to the classical Drude theory for metal-carbon samples has been estimated by means of experimental investigations of nonlinearities of the current-voltage characteristics. In order to increase the measurement sensitivity and to eliminate sample heating, the measurements were performed in ac-regime by a method of the combinatoric frequency generation in nonlinear systems. The conductivity of the sample represented corresponds to the metal – insulator transition; the dc-resistivity to temperature R(T) curve exhibits a pronounced minimum in the temperature range, where the quantum corrections take place. The absence of the corresponding bending for the temperature dependence of the output signal on the combination frequency enables one to exclude sample heating as a reason for the nonlinearity. It was shown that the nonlinearity is caused by the electric field influence on both the weak localization and electron-electron interaction effects. It was suggested that the main mechanism of the electric field effect is the electronic system overheating relative to the crystal temperature that, according to the theory, modifies contributions to the electric conductivity for both types of quantum corrections. Application of an external magnetic field might by of use for separation of these contributions.

Author Biographies

Vladimir A. Dorosinets, Belarusian State University, Niezaliežnasci Avenue, 4, 220030, Minsk, Belarus

PhD (physics and mathematics); leading researcher at the research laboratory of physics of electronic materials, department of semiconductor physics and nanoelectronics, faculty of physics
Ho Viet, Belarusian State University, Niezaliežnasci Avenue, 4, 220030, Minsk, Belarus

postgraduate student at the department of semiconductor physics and nanoelectronics, faculty of physics

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