Abstract
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. © 2000 American Institute of Physics.
Original language | English |
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Pages (from-to) | 3495-3500 |
Number of pages | 6 |
Journal | Journal of Applied Physics |
Volume | 88 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2000 |
Externally published | Yes |