Picosecond photocurrent measurements of negative differential velocity in GaAs/AlAs superlattices

Christophe Minot; H. Le Person; Francis Mollot; Jean Francois Palmier

doi:10.1117/12.24548

1 February 1991 Picosecond photocurrent measurements of negative differential velocity in GaAs/AlAs superlattices

Christophe Minot, H. Le Person, Francis Mollot, Jean Francois Palmier

Proceedings Volume 1362, Physical Concepts of Materials for Novel Optoelectronic Device Applications II: Device Physics and Applications; (1991) https://doi.org/10.1117/12.24548
Event: Physical Concepts of Materials for Novel Optoelectronic Device Applications, 1990, Aachen, Germany

Abstract

Evidence of electron negative differential velocity in GaAs/AlAs superlattices is obtained from time-resolved photocurrent in n-i-n perpendicular photoconductors at 77K. The miniband widths range from 22meV to 78meV. Approximate field-velocity laws are derived using a numerical simulation relying on the drift-diffusion equations. They are interpreted in terms of the Esaki-Tsu model in which the non-linearity results from the non-parabolic miniband dispersion.

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Christophe Minot, H. Le Person, Francis Mollot, and Jean Francois Palmier "Picosecond photocurrent measurements of negative differential velocity in GaAs/AlAs superlattices", Proc. SPIE 1362, Physical Concepts of Materials for Novel Optoelectronic Device Applications II: Device Physics and Applications, (1 February 1991); https://doi.org/10.1117/12.24548

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