title: 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.
authors: Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA.
authors: J B
authors: JB
authors: Hertzberg
authors: O O
authors: OO
authors: Otelaja
authors: N J
authors: NJ
authors: Yoshida
authors: R D
authors: RD
authors: Robinson