AI Article Synopsis
- The study reveals strong nonreciprocal behavior in quantum dot exciton spins when coupled to nanophotonic waveguides using resonant laser excitation.
- A chirally coupled quantum dot shows that spin up and spin down excitons couple differently, affecting the transmission spectrum based on propagation direction.
- The findings suggest potential applications for spin-based quantum optical components like optical diodes and circulators in solid-state systems, breaking the traditional reciprocity of light transmission.
Article Abstract
We report strongly nonreciprocal behavior for quantum dot exciton spins coupled to nanophotonic waveguides under resonant laser excitation. A clear dependence of the transmission spectrum on the propagation direction is found for a chirally coupled quantum dot, with spin up and spin down exciton spins coupling to the left and right propagation directions, respectively. The reflection signal shows an opposite trend to the transmission, which a numerical model indicates is due to direction-selective saturation of the quantum dot. The chiral spin-photon interface we demonstrate breaks reciprocity of the system and opens the way to spin-based quantum optical components such as optical diodes and circulators in a chip-based solid-state environment.
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| http://dx.doi.org/10.1021/acs.nanolett.8b01869 | DOI Listing |
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