Search results

Sort By:

Limit search:

Non-Activated Conductivity of Hot Electrons in Localization Regime

100%

Łuskowski J., Grynberg M.

Acta Physica Polonica A

1995

vol. 87

issue 1

253-256

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.

Refine search results

1 Acta Physica Polonica A

1 1995

1 Grynberg M.

1 Łuskowski J.

Search results

Non-Activated Conductivity of Hot Electrons in Localization Regime