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29 March 2024
 
  » arxiv » 0901.3520

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Phonon-mediated non-equilibrium interaction between nanoscale devices
G.J. Schinner ; H.P. Tranitz ; W. Wegscheider ; J.P. Kotthaus ; S. Ludwig ;
Date 22 Jan 2009
AbstractInteractions 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 back-scattered by absorbing interface phonons. Our results imply that phonon-mediated interaction plays an important role for the decoherence of solid-state-based quantum circuits.
Source arXiv, 0901.3520
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