Abstract
We demonstrate a new effect where the electron-photon interaction in a ballistic microconstriction plays the same role as impurity scattering does in a "dirty" system. In the presence of an external electromagnetic field all relevant photons are coherent, and spatial interference effects in electron-photon scattering become possible in spite of the inelastic nature of the collisions. These interference effects can be controlled by the gate voltage or the frequency of the electromagnetic field. As an illustration we calculate the photoconductance of a double point-contact geometry.
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