Phonon-mediated non-equilibrium interaction between nanoscale devices

TL;DR

This study demonstrates how interface acoustic phonons mediate non-equilibrium interactions between nanoscale devices in a 2DES, affecting electron excitation and decoherence in quantum circuits.

Contribution

It provides experimental evidence of phonon-mediated interactions between nanoscale devices using phonon-spectroscopy in a 2DES.

Findings

Energy transfer bounded by Fermi-level electrons

Phonon absorption excites and back-scatters electrons

Implications for decoherence in quantum circuits

Abstract

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 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.