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Title: Acoustic phonon spectrum engineering in bulk crystals via incorporation of dopant atoms

Here we report results of Brillouin—Mandelstam spectroscopy of transparent Al 2O 3 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 Al 2O 3 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] ;  [2] ; ORCiD logo [1] ;  [1] ;  [2] ;  [1]
  1. Univ. of California, Riverside, CA (United States)
  2. Univ. of California, Riverside, CA (United States); Univ. of California, San Diego, CA (United States)
Publication Date:
Grant/Contract Number:
SC0012670
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)
Research Org:
Univ. of California, Riverside, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1503636
Alternate Identifier(s):
OSTI ID: 1436383

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., 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. doi:10.1063/1.5030558.
Kargar, Fariborz, Penilla, Elias H., Aytan, Ece, Lewis, Jacob S., Garay, Javier E., and Balandin, Alexander A.. 2018. "Acoustic phonon spectrum engineering in bulk crystals via incorporation of dopant atoms". United States. doi:10.1063/1.5030558.
@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 = {2018},
month = {5}
}

Works referenced in this record:

Thermal conductivity of isotopically enriched silicon
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Thermal conductivity of individual silicon nanowires
journal, October 2003
  • Li, Deyu; Wu, Yiying; Kim, Philip
  • Applied Physics Letters, Vol. 83, Issue 14, p. 2934-2936
  • DOI: 10.1063/1.1616981