Soft Carrier Multiplications by Hot Electrons in Graphene

By using Boltzmann formalism, we show that carrier multiplication by impact ionization can take place at relatively low electric fields during electronic transport in graphene. Because of the absence of energy gap, this effect is not characterized by a field threshold unlike in conventional semicond...

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Bibliographic Details
Published in:arXiv.org 2011-02
Main Authors: Girdhar, Anuj, Leburton, Jean-Pierre
Format: Article
Language:English
Subjects:
Carrier density
Electric fields
Electron transport
Energy gap
Graphene
Hot electrons
Ionization
Multiplication
Quadratic equations
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Summary:By using Boltzmann formalism, we show that carrier multiplication by impact ionization can take place at relatively low electric fields during electronic transport in graphene. Because of the absence of energy gap, this effect is not characterized by a field threshold unlike in conventional semiconductors, but is a quadratic function of the electric field. We also show that the resulting current is an increasing function of the electronic temperature, but decreases with increasing carrier concentration.
ISSN:2331-8422
DOI:10.48550/arxiv.1103.0051