Evidence for Virtual Phonon Exchange Between 2-D Electron Gases
This paper reviews our study of the interaction of phonons with two-dimensional electron gases (2DEG) using a direct probe of electron-electron (e-e) scattering rates. We find evidence for an e-e scattering process whose temperature and distance dependence strongly suggest a phonon-mediated interaction. The magnitude of the scattering rates, however, are much greater than can be accounted for by real phonon exchange. Instead, we argue that we have directly detected scattering due to the exchange of virtual phonons.