| Autor: |
Dhall, Rohan, Vigil-Fowler, Derek, Dycus, J. Houston, Kirste, Ronny, Mita, Seiji, Sitar, Zlatko, Collazo, Ramon, LeBeau, James M. |
| Rok vydání: |
2017 |
| Předmět: |
|
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1063/1.5012742 |
| Popis: |
Here we demonstrate that high energy electrons can be used to explore the collective oscillation of $s$, $p$, and $d$ orbital electrons at the nanometer length scale. Using epitaxial AlGaN/AlN quantum wells as a test system, we observe the emergence of additional features in the loss spectrum with increasing Ga content. A comparison of the observed spectra with ab--initio theory reveals the origin of these spectral features is attributed to 3$d$--electrons contributed by Ga. We find that these modes differ in energy from the valence electron plasmons in Al$_{1-x}$Ga$_x$N due to the different polarizability of the $d$ electrons. Finally, we study the dependence of observed plasmon modes on Ga content, lending insight into plasmon coupling with electron--hole excitations. |
| Databáze: |
arXiv |
| Externí odkaz: |
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