1. Terahertz intersubband absorption in non-polar m-plane AlGaN/GaN quantum wells
- Author
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Edmunds, C., Shao, J., Shirazi-HD, M., Manfra, M. J., and Malis, O.
- Subjects
Condensed Matter - Mesoscale and Nanoscale Physics - Abstract
We demonstrate THz intersubband absorption (15.6-26.1 meV) in m-plane AlGaN/GaN quantum wells. We find a trend of decreasing peak energy with increasing quantum well width, in agreement with theoretical expectations. However, a blue-shift of the transition energy of up to 14 meV was observed relative to the calculated values. This blue-shift is shown to decrease with decreasing charge density and is therefore attributed to many-body effects. Furthermore, a ~40% reduction in the linewidth (from roughly 8 to 5 meV) was obtained by reducing the total sheet density and inserting undoped AlGaN layers that separate the wavefunctions from the ionized impurities in the barriers.
- Published
- 2014
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