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

Kargar Fariborz; Debnath Bishwajit; Kakko Joona Pekko P.; Saynatjoki Antti; Lipsanen Harri; Nika Denis; Lake Roger K.; Balandin Alexander A.

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KARGAR, Fariborz, DEBNATH, Bishwajit, KAKKO, Joona Pekko P., SAYNATJOKI, Antti, LIPSANEN, Harri, NIKA, Denis, LAKE, Roger K., BALANDIN, Alexander A.. Direct observation of confined acoustic phonon polarization branches in free-standing semiconductor nanowires. In: Nature Communications, 2016, vol. 7, p. 0. ISSN 2041-1723. DOI: https://doi.org/10.1038/ncomms13400

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Nature Communications

Volumul 7 / 2016 / ISSN 2041-1723

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

DOI:https://doi.org/10.1038/ncomms13400

Pag. 0-0

Kargar Fariborz¹, Debnath Bishwajit¹, Kakko Joona Pekko P.², Saynatjoki Antti², Lipsanen Harri², Nika Denis³, Lake Roger K.¹, Balandin Alexander A.¹

¹ University of California, Riverside,
² Aalto University, Espoo,
³ Moldova State University

Disponibil în IBN: 7 noiembrie 2017

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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. The obtained results can lead to more efficient nanoscale control of acoustic phonons, with benefits for nanoelectronic, thermoelectric and spintronic devices.

Cuvinte-cheie
EMTREE drug terms nanowire GEOBASE Subject Index acoustic data, electrical conductivity, electron, light scattering, nanoparticle, polarization, spectroscopy EMTREE medical terms acoustics, article, brillouin mandelstam spectroscopy, dispersion, light scattering, molecular electronics, phonon, polarization, semiconductor, spectroscopy

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GEOBASE Subject Index
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