Non-Activated Conductivity of Hot Electrons in Localization Regime

• Authors: J. Łuskowski , M. Grynberg
• Languages of publication: EN

Abstracts

EN

Temperature (T) dependence of conductivity (σ) was studied in semi­-insulating GaAs as a function of the magnetic field (B) for 1.8 K < T < 40 K for high electric fields. An infrared illumination of a sample and application of an electric field caused a non-equilibrium distribution of electrons in the conduction band. An increase in B caused a localization transition which manifested itself by a gradual disappearance of the impact ionization of shallow bound states. The transition was connected with a change from a non-activated to an activated conductivity only if T > 4 K, otherwise σ showed only a non-activated character. It is proposed that for T < 4 K the electron distribution function is mostly determined by optical and electric field excitations, which results in a non-activated conductivity. For T > 4 K thermal excitations become dominant which leads to an activated character of σ.

Keywords

EN

72.20.Ht; 72.20.My

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1995
• Volume: 87
• Issue: 1
• Pages: 253-256

Dates

published

1995-01

Contributors

author

J. Łuskowski

• Institute of Experimental Physics, University of Warsaw, Hoża 69, 00-681 Warszawa, Poland

author

M. Grynberg

• Institute of Experimental Physics, University of Warsaw, Hoża 69, 00-681 Warszawa, Poland