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Lifetime of sub-THz coherent acoustic phonons in a GaAs-AlAs superlattice

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4789520· OSTI ID:1381949
Here we measure the lifetime of the zone-center 340 GHz longitudinal phonon mode in a GaAs-AlAs superlattice excited and probed with femtosecond laser pulses. By comparing measurements conducted at room temperature and liquid nitrogen temperature, we separate the intrinsic (phonon-phonon scattering) and extrinsic contributions to phonon relaxation. The estimated room temperature intrinsic lifetime of 0.95 ns is compared to available calculations and experimental data for bulk GaAs. We conclude that ~0.3 THz phonons are in the transition zone between Akhiezer and Landau-Rumer regimes of phonon-phonon relaxation at room temperature.
Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
FG02-00ER15087; SC0001299
OSTI ID:
1381949
Alternate ID(s):
OSTI ID: 1105271
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 4 Vol. 102; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (9)

Photo-excited charge carriers suppress sub-terahertz phonon mode in silicon at room temperature journal October 2016
Low voltage control of exchange coupling in a ferromagnet-semiconductor quantum well hybrid structure journal July 2019
Propagation of THz acoustic wave packets in GaN at room temperature journal February 2018
Characterization of longitudinal acoustic phonons in InGaAsP multiple quantum wells by asynchronous optical sampling journal November 2018
Generation and Propagation of Superhigh-Frequency Bulk Acoustic Waves in Ga As journal October 2019
Reconstructing phonon mean-free-path contributions to thermal conductivity using nanoscale membranes journal June 2015
Direct measurement of coherent subterahertz acoustic phonons mean free path in GaAs journal May 2016
Akhiezer mechanism limits coherent heat conduction in phononic crystals journal October 2018
Direct measurement of coherent subterahertz acoustic phonons mean free path in GaAs text January 2015

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