An ultrasound emitter based on assisted tunneling

Abstract

The problem of electron tunneling assisted by an elementary excitation in a double barrier resonant device is usually described within a sequential (decoherent) approximation. By solving exactly the many-body problem for a simplified model of electron -phonon interaction we show, analytically and numerically, that the assisted tunneling peak can be strongly enhanced by an appropriate election of the geometrical parameters of the device. This induces a symmetry condition in the Fock space that maximizes the effectiveness of the scattering process. We propose that this process could provide the primary longitudinal optical phonons required to operate a phonon laser (SASER). q