Biased GaAs/AlGaAs superlattices employed as energy filter for ballistic electron emission microscopy
✍ Scribed by Smoliner, J.; Heer, R.; Strasser, G.
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 107 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0142-2421
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✦ Synopsis
In this work, buried superlattices are employed as an energy Ðlter in order to study the energy Al 0.4 Ga 0.6 As/GaAs distribution of the ballistic electron current in ballistic electron emission microscopy (BEEM). As the measured total transmission of the superlattice is in excellent agreement with the calculated transmission, the superlattice is a promising tunable energy Ðlter for studying the energy distribution of ballistic electrons. We further show that due to the large di †erence in electron masses between the Au base layer and the GaAs collector, parallel momentum conservation leads to considerable electron refraction at the Au/GaAs interface. As a consequence, the energy distribution of ballistic electrons is inverted beyond the Au/GaAs interface.