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Title: Direct observation of confined acoustic phonon polarization branches in free-standing semiconductor nanowires

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms13400· OSTI ID:1361532
ORCiD logo [1];  [1];  [2];  [3]; ORCiD logo [2];  [4];  [1];  [1]
  1. Univ. of California - Riverside, Riverside, CA (United States)
  2. Aalto Univ., Aalto (Finland)
  3. Aalto Univ., Aalto (Finland); Univ. of Eastern Finland, Joensuu (Finland)
  4. Univ. of California - Riverside, Riverside, CA (United States); Moldova State Univ., Chisinau (Republic of Moldova)

Similar to electron waves, the phonon states in semiconductors can undergo changes induced by external boundaries. However, despite strong scientific and practical importance, conclusive experimental evidence of confined acoustic phonon polarization branches in individual free-standing nanostructures is lacking. Here we report results of Brillouin-Mandelstam light scattering spectroscopy, which reveal multiple (up to ten) confined acoustic phonon polarization branches in GaAs nanowires with a diameter as large as 128 nm, at a length scale that exceeds the grey phonon mean-free path in this material by almost an order-of-magnitude. The dispersion modification and energy scaling with diameter in individual nanowires are in excellent agreement with theory. The phonon confinement effects result in a decrease in the phonon group velocity along the nanowire axis and changes in the phonon density of states. Furthermore, the obtained results can lead to more efficient nanoscale control of acoustic phonons, with benefits for nanoelectronic, thermoelectric and spintronic devices.

Research Organization:
Univ. of California - Riverside, Riverside, CA (United States); Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012670
OSTI ID:
1361532
Journal Information:
Nature Communications, Vol. 7; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 62 works
Citation information provided by
Web of Science

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Cited By (10)

Temperature-dependent thermal conductivity of a single Germanium nanowire measured by Optothermal Raman Spectroscopy preprint January 2020
The Discrete Noise of Magnons text January 2018
Heat conduction tuning by wave nature of phonons journal August 2017
Phonon and heat transport control using pillar-based phononic crystals journal August 2018
Akhiezer mechanism limits coherent heat conduction in phononic crystals journal October 2018
Thermal Transport in 3D Nanostructures journal August 2019
Cortical-like mini-columns of neuronal cells on zinc oxide nanowire surfaces journal March 2019
Acoustic phonons in nanowires probed by ultrafast pump-probe spectroscopy journal September 2018
The discrete noise of magnons journal March 2019
Acoustic phonon spectrum engineering in bulk crystals via incorporation of dopant atoms journal May 2018

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