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One of the central assumptions in quantum electrodynamics is to invoke the dipole approximation because (quantum) emitters are much smaller than the wavelength of light. The main consequence is that only the electric dipole plays a role in light-matter interactions at optical frequencies. In this paper we show that semiconductor quantum dots possess large magnetic-dipole and electric-quadrupole moments,...
We experimentally demonstrate spin-polarized light emission from quantum dots coupled to a single-element nanoantenna with resonant multipolar moments. We observe spin-momentum locking resulting in photons of opposite spin emitted in opposite directions.
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