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Title: Probing collective oscillation of d -orbital electrons at the nanoscale

Abstract

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 the increasing Ga content. A comparison of the observed spectra with ab-initio theory reveals that the origin of these spectral features lies in excitations of 3d-electrons contributed by Ga. We find that these modes differ in energy from the valence electron plasmons in Al1-xGaxN due to the different polarizabilities of the d electrons. Finally, we study the dependence of observed spectral features on the Ga content, lending insights into the origin of these spectral features, and their coupling with electron-hole excitations.

Authors:
 [1];  [2];  [1];  [3];  [3];  [1];  [1];  [3]
  1. Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695, USA
  2. National Renewable Energy Laboratory, Golden, Colorado 80401, USA
  3. Adroit Materials, Inc., Cary, North Carolina 27518, USA
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1424905
Report Number(s):
NREL/JA-2C00-71049
Journal ID: ISSN 0003-6951
DOE Contract Number:
AC36-08GO28308
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 112; Journal Issue: 6
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; plasmons; quantum wells; epitaxy; band structure; condensed matter electronic structure

Citation Formats

Dhall, Rohan, Vigil-Fowler, Derek, Houston Dycus, J., Kirste, Ronny, Mita, Seiji, Sitar, Zlatko, Collazo, Ramon, and LeBeau, James M. Probing collective oscillation of d -orbital electrons at the nanoscale. United States: N. p., 2018. Web. doi:10.1063/1.5012742.
Dhall, Rohan, Vigil-Fowler, Derek, Houston Dycus, J., Kirste, Ronny, Mita, Seiji, Sitar, Zlatko, Collazo, Ramon, & LeBeau, James M. Probing collective oscillation of d -orbital electrons at the nanoscale. United States. doi:10.1063/1.5012742.
Dhall, Rohan, Vigil-Fowler, Derek, Houston Dycus, J., Kirste, Ronny, Mita, Seiji, Sitar, Zlatko, Collazo, Ramon, and LeBeau, James M. Mon . "Probing collective oscillation of d -orbital electrons at the nanoscale". United States. doi:10.1063/1.5012742.
@article{osti_1424905,
title = {Probing collective oscillation of d -orbital electrons at the nanoscale},
author = {Dhall, Rohan and Vigil-Fowler, Derek and Houston Dycus, J. and Kirste, Ronny and Mita, Seiji and Sitar, Zlatko and Collazo, Ramon and LeBeau, James M.},
abstractNote = {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 the increasing Ga content. A comparison of the observed spectra with ab-initio theory reveals that the origin of these spectral features lies in excitations of 3d-electrons contributed by Ga. We find that these modes differ in energy from the valence electron plasmons in Al1-xGaxN due to the different polarizabilities of the d electrons. Finally, we study the dependence of observed spectral features on the Ga content, lending insights into the origin of these spectral features, and their coupling with electron-hole excitations.},
doi = {10.1063/1.5012742},
journal = {Applied Physics Letters},
number = 6,
volume = 112,
place = {United States},
year = {Mon Feb 05 00:00:00 EST 2018},
month = {Mon Feb 05 00:00:00 EST 2018}
}