Ballistic transport through GaAs–AlGaAs superlattices in transverse magnetic fields

In this work, ballistic electron transport through the lowest miniband of a biased GaAs–AlGaAs superlattice is investigated in transverse magnetic fields. As method we employ a solid-state version of ballistic electron emission microscopy/spectroscopy using a metal-insulator-metal injector structure...

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Published in:Journal of applied physics 2000-09, Vol.88 (6), p.3495-3500
Main Authors: Rakoczy, D., Smoliner, J., Heer, R., Strasser, G.
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Language:English
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creator Rakoczy, D.
Smoliner, J.
Heer, R.
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description In this work, ballistic electron transport through the lowest miniband of a biased GaAs–AlGaAs superlattice is investigated in transverse magnetic fields. As method we employ a solid-state version of ballistic electron emission microscopy/spectroscopy using a metal-insulator-metal injector structure that replaces the tip of the scanning tunneling microscope (STM). The ballistic electron current measured as a function of the collector bias shows a peak at flatband conditions indicating coherent transport through the superlattice miniband. With increasing transverse magnetic fields, this peak is quenched and evidence of sequential LO-phonon scattering inside the superlattice is found. Using an extended transfer matrix method, the observed effects are quantitatively explained; differences to previous STM based measurements are discussed.
doi_str_mv 10.1063/1.1288232
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title Ballistic transport through GaAs–AlGaAs superlattices in transverse magnetic fields
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