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Title: Ultrafast study of phonon transport in isotopically controlled semiconductor nanostructures: Phonons in isotopically controlled multilayers

Abstract

Isotopically modulated silicon and germanium multilayers are analyzed by means of femtosecond spectroscopy and pulsed X-ray scattering for determining thermal conductivity and phonon modes. Isotopic modulation decreases thermal conductivity stronger than expected from a band bending model in the coherent phonon transport regime, in particular for silicon. Femtosecond spectroscopy and X-ray scattering resolve zone-folded vibration modes, which are located at the edge of the new, smaller Brillouin zone due to the multilayer periodicity. These modes can contribute to the reduction of thermal conductivity by Umklapp processes within the zone-folded mini-bands. Color-coded increase in ultrafast X-ray scattering in vicinity to the mini-zone boundary of a germanium multilayer.

Authors:
 [1];  [2];  [2];  [3];  [3];  [1];  [1];  [1];  [4];  [4];  [5];  [5];  [1]
  1. Karlsruhe Inst. of Technology (KIT) (Germany)
  2. University of Muenster (Germany)
  3. Univ. Konstanz (Germany)
  4. Aarhus Univ. (Denmark)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1530229
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physica Status Solidi. A, Applications and Materials Science
Additional Journal Information:
Journal Volume: 213; Journal Issue: 3; Journal ID: ISSN 1862-6300
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Issenmann, Daniel, Eon, Soizic, Bracht, Hartmut, Hettich, Mike, Dekorsy, Thomas, Buth, Gernot, Steininger, Ralph, Baumbach, Tilo, Lundsgaard Hansen, John, Nylandsted Larsen, Arne, Ager, Joel W., Haller, Eugene E., and Plech, Anton. Ultrafast study of phonon transport in isotopically controlled semiconductor nanostructures: Phonons in isotopically controlled multilayers. United States: N. p., 2015. Web. doi:10.1002/pssa.201532462.
Issenmann, Daniel, Eon, Soizic, Bracht, Hartmut, Hettich, Mike, Dekorsy, Thomas, Buth, Gernot, Steininger, Ralph, Baumbach, Tilo, Lundsgaard Hansen, John, Nylandsted Larsen, Arne, Ager, Joel W., Haller, Eugene E., & Plech, Anton. Ultrafast study of phonon transport in isotopically controlled semiconductor nanostructures: Phonons in isotopically controlled multilayers. United States. doi:10.1002/pssa.201532462.
Issenmann, Daniel, Eon, Soizic, Bracht, Hartmut, Hettich, Mike, Dekorsy, Thomas, Buth, Gernot, Steininger, Ralph, Baumbach, Tilo, Lundsgaard Hansen, John, Nylandsted Larsen, Arne, Ager, Joel W., Haller, Eugene E., and Plech, Anton. Fri . "Ultrafast study of phonon transport in isotopically controlled semiconductor nanostructures: Phonons in isotopically controlled multilayers". United States. doi:10.1002/pssa.201532462. https://www.osti.gov/servlets/purl/1530229.
@article{osti_1530229,
title = {Ultrafast study of phonon transport in isotopically controlled semiconductor nanostructures: Phonons in isotopically controlled multilayers},
author = {Issenmann, Daniel and Eon, Soizic and Bracht, Hartmut and Hettich, Mike and Dekorsy, Thomas and Buth, Gernot and Steininger, Ralph and Baumbach, Tilo and Lundsgaard Hansen, John and Nylandsted Larsen, Arne and Ager, Joel W. and Haller, Eugene E. and Plech, Anton},
abstractNote = {Isotopically modulated silicon and germanium multilayers are analyzed by means of femtosecond spectroscopy and pulsed X-ray scattering for determining thermal conductivity and phonon modes. Isotopic modulation decreases thermal conductivity stronger than expected from a band bending model in the coherent phonon transport regime, in particular for silicon. Femtosecond spectroscopy and X-ray scattering resolve zone-folded vibration modes, which are located at the edge of the new, smaller Brillouin zone due to the multilayer periodicity. These modes can contribute to the reduction of thermal conductivity by Umklapp processes within the zone-folded mini-bands. Color-coded increase in ultrafast X-ray scattering in vicinity to the mini-zone boundary of a germanium multilayer.},
doi = {10.1002/pssa.201532462},
journal = {Physica Status Solidi. A, Applications and Materials Science},
number = 3,
volume = 213,
place = {United States},
year = {2015},
month = {11}
}

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