High-field perpendicular conduction in GaAs/AlAs superlattices

Sibille, A.; Palmier, J. F.; Minot, C.; Mollot, F.
January 1989
Applied Physics Letters;1/9/1989, Vol. 54 Issue 2, p165
Academic Journal
Miniband conduction in undoped GaAs/AlAs superlattices (SLs) has been investigated through current-voltage measurements on n+-SL-n+ structures. From the comparison with simulations based on an effective medium approximation for the conduction through the superlattice, we directly obtain the field dependence of the electron velocity perpendicular to the layers. Our data show strong evidence of negative differential velocity in a 35.5/20 Ã… (well/barrier width) SL.


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