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1995 | 87 | 1 | 253-256
Article title

Non-Activated Conductivity of Hot Electrons in Localization Regime

Content
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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
Year
Volume
87
Issue
1
Pages
253-256
Physical description
Dates
published
1995-01
References
Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv87z142kz
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