Direct measurements of the electron-acoustic phonon interaction in GaAs quantum wire structures

In this paper we describe new direct measurements of the emission and absor ption of acoustic phonons by quasi-one-dimensional electrons in GaAs quantu m wire structures. The measurements were made using heat-pulse techniques: for the absorption experiments, nonequilibrium phonons were generated using a metal-film resistive heater and the absorption detected via the change i n conductivity induced in the quantum wire itself (phonoconductivity); in t he emission experiments, the electrons in a quantum wire array were heated electrically and the emitted phonons detected by superconducting bolometers . (C) 1999 Elsevier Science B.V. All rights reserved.