Nonlinear polarizability and plasmon resonances in terahertz photoconductivity

The nonlinear polarization of an electron plasma in an incident terahertz (THz) field is examined in an iterated shielded potential approximation. It is found to exhibit resonant behavior when the incident terahertz frequency matches the plasma frequency, with concomitant resonant increase of the di...

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Bibliographic Details
Published in:Solid state communications 2006-02, Vol.137 (6), p.338-342
Main Author: Horing, Norman J. Morgenstern
Format: Article
Language:English
Subjects:
A. Nanostructures
A. Plasmons
A. Semiconductor
A. Terahertz
Condensed matter: electronic structure, electrical, magnetic, and optical properties
D. Nonlinear
D. Photoconductivity
Electron states and collective excitations in thin films, multilayers, quantum wells, mesoscopic and nanoscale systems
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic transport in multilayers, nanoscale materials and structures
Exact sciences and technology
Physics
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Summary:The nonlinear polarization of an electron plasma in an incident terahertz (THz) field is examined in an iterated shielded potential approximation. It is found to exhibit resonant behavior when the incident terahertz frequency matches the plasma frequency, with concomitant resonant increase of the dielectric function. Such resonant behavior substantially reduces the effectiveness of the screened impurity scattering potentials, admitting resonant increase of conduction when the THz frequency matches the plasma frequency.
ISSN:0038-1098
1879-2766
DOI:10.1016/j.ssc.2005.09.031