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Non-equilibrium Phonon Generation and Detection in Microstructure Devices
Abstract
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
Sponsorship
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)
Date Issued
2011-10-31Publisher
American Institute of Physics
Subject
crystal microstructure; elemental semiconductors; phonons; quasiparticle; silicon; superconducting; junction devices
Previously Published As
Review of Scientific Instruments, 82, 2011, 104905-1-7
Type
article