Acoustic phonon spectrum engineering in bulk crystals via incorporation of dopant atoms
Abstract
Here we report results of Brillouin—Mandelstam spectroscopy of transparent Al2O3 crystals with Nd dopants. The ionic radius and atomic mass of Nd atoms are distinctively different from those of the host Al atoms. Our results show that even a small concentration of Nd atoms incorporated into the Al2O3 samples produces a profound change in the acoustic phonon spectrum. The velocity of the transverse acoustic phonons decreases by ~600 m/s at the Nd density of only ~0.1%. Interestingly, the decrease in the phonon frequency and velocity with the doping concentration is non-monotonic. The obtained results, demonstrating that modification of the acoustic phonon spectrum can be achieved not only by traditional nanostructuring but also by low-concentration doping, have important implications for thermal management as well as thermoelectric and optoelectronic devices.
- Authors:
-
[1];
- Univ. of California, Riverside, CA (United States)
- Univ. of California, Riverside, CA (United States); Univ. of California, San Diego, CA (United States)
- Publication Date:
- Research Org.:
- Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES); Univ. of California, Riverside, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1503636
- Alternate Identifier(s):
- OSTI ID: 1436383
- Grant/Contract Number:
- SC0012670
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied Physics Letters
- Additional Journal Information:
- Journal Volume: 112; Journal Issue: 19; Journal ID: ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Kargar, Fariborz, Penilla, Elias H., Aytan, Ece, Lewis, Jacob S., Garay, Javier E., and Balandin, Alexander A. Acoustic phonon spectrum engineering in bulk crystals via incorporation of dopant atoms. United States: N. p., 2018.
Web. doi:10.1063/1.5030558.
Kargar, Fariborz, Penilla, Elias H., Aytan, Ece, Lewis, Jacob S., Garay, Javier E., & Balandin, Alexander A. Acoustic phonon spectrum engineering in bulk crystals via incorporation of dopant atoms. United States. https://doi.org/10.1063/1.5030558
Kargar, Fariborz, Penilla, Elias H., Aytan, Ece, Lewis, Jacob S., Garay, Javier E., and Balandin, Alexander A. Tue .
"Acoustic phonon spectrum engineering in bulk crystals via incorporation of dopant atoms". United States. https://doi.org/10.1063/1.5030558. https://www.osti.gov/servlets/purl/1503636.
@article{osti_1503636,
title = {Acoustic phonon spectrum engineering in bulk crystals via incorporation of dopant atoms},
author = {Kargar, Fariborz and Penilla, Elias H. and Aytan, Ece and Lewis, Jacob S. and Garay, Javier E. and Balandin, Alexander A.},
abstractNote = {Here we report results of Brillouin—Mandelstam spectroscopy of transparent Al2O3 crystals with Nd dopants. The ionic radius and atomic mass of Nd atoms are distinctively different from those of the host Al atoms. Our results show that even a small concentration of Nd atoms incorporated into the Al2O3 samples produces a profound change in the acoustic phonon spectrum. The velocity of the transverse acoustic phonons decreases by ~600 m/s at the Nd density of only ~0.1%. Interestingly, the decrease in the phonon frequency and velocity with the doping concentration is non-monotonic. The obtained results, demonstrating that modification of the acoustic phonon spectrum can be achieved not only by traditional nanostructuring but also by low-concentration doping, have important implications for thermal management as well as thermoelectric and optoelectronic devices.},
doi = {10.1063/1.5030558},
journal = {Applied Physics Letters},
number = 19,
volume = 112,
place = {United States},
year = {Tue May 08 00:00:00 EDT 2018},
month = {Tue May 08 00:00:00 EDT 2018}
}
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Figures / Tables:
FIG. 1: (a) SEM micrograph of a fracture surface of the polycrystalline 0.25 at. % Nd: Al2O3 revealing an ~300 nm equiaxed grain structure. The scale bar is 200 nm. The inset shows a picture of a representative sample on top of the printed text, revealing optical transparency. The diametermore »
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Works referencing / citing this record:
The discrete noise of magnons
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Phonon-engineered Nb film as a Mott-insulating tunnel-junction network
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