Abstract
It is well known that a localized electronic impurity state couples to the vibrational modes of an insulating nanoparticle through the ordinary electron–phonon interaction, enhanced by the effects of quantum confinement. In this paper we show that an electron can also interact with the translational degrees of freedom of a nanoparticle. The form of the coupling is dictated by Einstein's equivalence principle and is independent of the ordinary electron–phonon interaction. We calculate the rate of electronic energy relaxation provided by this mechanism and establish its experimental observability.
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