Abstract
It is predicted that an incoming electromagnetic wave possessing a net angular momentum may generate a steady-state current in a mesoscopic metallic (or semiconducting) ring by means of its nonlinear electrodynamic interaction with the conduction electrons of the ring. In a sense this phenomenon is analogous to the classical photon-drag effect which originates in a nonlinear exchange of linear momentum between the photon and electron fields. In the wake of the establishment of the basic theory, a numerical calculation and an analysis of the angular-momentum photon drag in a mesoscopic Au ring are presented. Particular attention is paid to a study of the photon-drag current as a function of the photon energy, and it is shown that the drag current provides a detailed fingerprint of the allowed angular electronic transitions of the ring if the collision frequency of the conduction electrons is sufficiently low.
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