We demonstrate a method to excite locally a controllable, non-thermal distribution of acoustic phonon modes ranging from 0 to ∼200 GHz in a silicon microstructure, by decay of excited quasiparticle states in an attached superconducting tunnel junction (STJ). The phonons transiting the structure ballistically are detected by a second STJ, allowing comparison of direct with indirect transport pathways. This method may be applied to study how different phonon modes contribute to the thermal conductivity of nanostructures. © 2011 American Institute of Physics.
|Original language||English (US)|
|Journal||Review of Scientific Instruments|
|State||Published - Nov 2 2011|
Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): KUS-C1-018-02
Acknowledgements: The authors thank R. B. Van Dover, J. Blakely, S. Baker, K. Schwab, and Cornell LASSP for loan of key equipment, and L. Spietz for photolithography recipes. We thank R. B. Van Dover, K. Schwab, E. Smith, J. Parpia, D. Ralph, B. Plourde, M. Blencowe, D. Westly, R. Pohl, P. Berberich, and C. Mellor for helpful discussions and thank D. Toledo, J. Chang and A. Lin for help with apparatus. The authors acknowledge funding from the National Science Foundation (NSF) (DMR 0520404) and Department of Energy (DOE) (DE-SC0001086). This publication is based on work supported in part by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST). This work was performed in part at the Cornell NanoScale Facility, a member of the National Nanotechnology Infrastructure Network, which is supported by the National Science Foundation (Grant ECS-0335765).
This publication acknowledges KAUST support, but has no KAUST affiliated authors.