Tuesday, 05 May, 2009
Phonon-Mediated Nonequilibrium Interaction between Nanoscale Devices
G. J. Schinner, H. P. Tranitz, W. Wegscheider, J. P. Kotthaus and S. Ludwig -
Phys. Rev. Lett. 102, 186801 (2009)
Interactions between mesoscopic devices induced by interface acoustic phonons propagating in the plane of a two-dimensional electron system (2DES) are investigated by phonon spectroscopy. In our experiments, ballistic electrons injected from a biased quantum point contact emit phonons and a portion of them are reabsorbed exciting electrons in a nearby degenerate 2DES. We perform energy spectroscopy on these excited electrons employing a tunable electrostatic barrier in an electrically separate and unbiased detector circuit. The transferred energy is found to be bounded by a maximum value corresponding to Fermi-level electrons excited and backscattered by absorbing interface phonons. Our results imply that phonon-mediated interaction plays an important role for the decoherence of solid-state-based quantum circuits.