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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. We report a comparison of the observed spectra with ab-initio theory reveals that the origin of these spectral features lies in excitations of 3$d$-electrons contributed by Ga. We find that these modes differ in energy from the valence electron plasmons in Al 1-xGa xN 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. North Carolina State Univ., Raleigh, NC (United States). Dept. of Materials Science and Engineering
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  3. Adroit Materials, Inc., Cary, NC (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); US Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF)
OSTI Identifier:
1424905
Report Number(s):
NREL/JA-2C00-71049
Journal ID: ISSN 0003-6951
Grant/Contract Number:  
AC36-08GO28308; FA9550-14-1-0182; DGE-1252376; ECCS-1542015
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 112; Journal Issue: 6; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
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, Dycus, J. Houston, 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, Dycus, J. Houston, 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, Dycus, J. Houston, 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. https://www.osti.gov/servlets/purl/1424905.
@article{osti_1424905,
title = {Probing collective oscillation of d-orbital electrons at the nanoscale},
author = {Dhall, Rohan and Vigil-Fowler, Derek and Dycus, J. Houston 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. We report a comparison of the observed spectra with ab-initio theory reveals that the origin of these spectral features lies in excitations of 3$d$-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},
issn = {0003-6951},
number = 6,
volume = 112,
place = {United States},
year = {2018},
month = {2}
}

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