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Metal-like heat conduction in laser-excited InSb probed by picosecond time-resolved x-ray diffraction

Sondhauss, Peter LU ; Synnergren, Ola LU ; Hansen, Tue LU ; Canton, Sophie LU ; Enquist, Henrik LU ; Srivastava, Alok LU and Larsson, Jörgen LU (2008) In Physical Review B (Condensed Matter and Materials Physics) 78(11).
Abstract
A semiconductor (InSb) showed transient metal- like heat conduction after excitation of a dense electron- hole plasma via short and intense light pulses. A related ultrafast strain relaxation was detected using picosecond time-resolved x-ray diffraction. The deduced heat conduction was, by a factor of 30, larger than the lattice contribution. The anomalously high heat conduction can be explained once the contribution from the degenerate photocarrier plasma is taken into account. The magnitude of the effect could provide the means for guiding heat in semiconductor nanostructures. In the course of this work, a quantitative model for the carrier dynamics in laser-irradiated semiconductors has been developed, which does not rely on any... (More)
A semiconductor (InSb) showed transient metal- like heat conduction after excitation of a dense electron- hole plasma via short and intense light pulses. A related ultrafast strain relaxation was detected using picosecond time-resolved x-ray diffraction. The deduced heat conduction was, by a factor of 30, larger than the lattice contribution. The anomalously high heat conduction can be explained once the contribution from the degenerate photocarrier plasma is taken into account. The magnitude of the effect could provide the means for guiding heat in semiconductor nanostructures. In the course of this work, a quantitative model for the carrier dynamics in laser-irradiated semiconductors has been developed, which does not rely on any adjustable parameters or ad hoc assumptions. The model includes various light absorption processes (interband, free carrier, two photon, and dynamical Burstein- Moss shifts), ambipolar diffusion, energy transport (heat and chemical potential), electrothermal effects, Auger recombination, collisional excitation, and scattering (elastic and inelastic). The model accounts for arbitrary degrees of degeneracy. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
78
issue
11
publisher
American Physical Society
external identifiers
  • wos:000259690800052
  • scopus:51749113977
ISSN
1098-0121
DOI
10.1103/PhysRevB.78.115202
language
English
LU publication?
yes
id
b50b7cf9-4785-486a-b9d9-e4dec72adbbb (old id 1285991)
date added to LUP
2009-02-04 10:29:26
date last changed
2018-01-07 07:25:44
@article{b50b7cf9-4785-486a-b9d9-e4dec72adbbb,
  abstract     = {A semiconductor (InSb) showed transient metal- like heat conduction after excitation of a dense electron- hole plasma via short and intense light pulses. A related ultrafast strain relaxation was detected using picosecond time-resolved x-ray diffraction. The deduced heat conduction was, by a factor of 30, larger than the lattice contribution. The anomalously high heat conduction can be explained once the contribution from the degenerate photocarrier plasma is taken into account. The magnitude of the effect could provide the means for guiding heat in semiconductor nanostructures. In the course of this work, a quantitative model for the carrier dynamics in laser-irradiated semiconductors has been developed, which does not rely on any adjustable parameters or ad hoc assumptions. The model includes various light absorption processes (interband, free carrier, two photon, and dynamical Burstein- Moss shifts), ambipolar diffusion, energy transport (heat and chemical potential), electrothermal effects, Auger recombination, collisional excitation, and scattering (elastic and inelastic). The model accounts for arbitrary degrees of degeneracy.},
  author       = {Sondhauss, Peter and Synnergren, Ola and Hansen, Tue and Canton, Sophie and Enquist, Henrik and Srivastava, Alok and Larsson, Jörgen},
  issn         = {1098-0121},
  language     = {eng},
  number       = {11},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Metal-like heat conduction in laser-excited InSb probed by picosecond time-resolved x-ray diffraction},
  url          = {http://dx.doi.org/10.1103/PhysRevB.78.115202},
  volume       = {78},
  year         = {2008},
}