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Nanoscale Heat Transport through Epitaxial Ultrathin Hetero Films: Bi(111)/Si(001) and Bi(111)/Si(111)

Published online by Cambridge University Press:  06 March 2012

Anja Hanisch-Blicharski ,
Simone Wall ,
Annika Kalus ,
Tim Frigge  and
Michael Horn- von Hoegen
Anja Hanisch-Blicharski
Affiliation:
Faculty of Physics and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, 47057 Duisburg, Germany
Simone Wall
Affiliation:
Faculty of Physics and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, 47057 Duisburg, Germany
Annika Kalus
Affiliation:
Faculty of Physics and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, 47057 Duisburg, Germany
Tim Frigge
Affiliation:
Faculty of Physics and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, 47057 Duisburg, Germany
Michael Horn- von Hoegen
Affiliation:
Faculty of Physics and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, 47057 Duisburg, Germany
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Abstract

The cooling process of ultrathin hetero films upon excitation with short laser pulses was studied for epitaxial Bi(111) films on Si(001) and Si(111) substrates by means of the Debye-Waller effect with ultrafast electron diffraction. From the exponential decay of the temperature, a cooling time constant was determined as a function of thickness for both substrates. For Bi/Si(111), a linear dependence between the decay constant and thickness was observed, even for 2.8 nm thin films , as predicted from the diffuse mismatch model (DMM) and the acoustic mismatch model (AMM). However, with Bi/Si(001), a significant deviation from this linear dependence was observed for film thicknesses below 5 nm.

Keywords

BiRHEEDthermal conductivity
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1404: Symposium W – Phonons in Nanomaterials–Theory, Experiments and Applications , 2012 , mrsf11-1404-w02-08
Copyright
Copyright © Materials Research Society 2012

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References

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