Inducing Chiral Photoluminescence in Single Photon Quantum Emitters using Chiral Induced Spin Selectivity Effects.

Chiral quantum emitters or non-reciprocal single photon devices have the potential for playing a significant role in future quantum communication-based infrastructure. To date, the realization of circularly polarized quantum emitters generally requires complex and bulky experimental infrastructures such as high magnetic/electric fields and cryogenic-temperatures. One potential means of realizing chiral quantum emission in solid-state systems is Chiral-Induced Spin Selectivity (CISS). This effect is a well-known physical phenomena known to enable control over electronic spins via the asymmetric transport of electronic spins in chiral organic and inorganic systems. We have explored the utilization of CISS effects as a means of manipulating the circular polarization of photoluminescence from single quantum emitters. Here, cadmium selenide-quantum dots are immobilized on a chiral surface prepared using electrodeposition of aniline. We observe both the inducement a significant degree of circular polarized photoluminescence emission and a magnetization-dependent photoluminescence quenching by using a ferromagnet valve in the chiral substrate. These observations illustrate the potential of a CISS-based mechanisms for realizing chiral single photon emission sources in solid-state material devices. By further exploring the dependence of circularly polarized emission on the quantum dot shell thickness and the thickness of the chiral films, we develop and demonstrate a model for the energy transfer pathways experienced by differing spin orientations in this system.