Electrostatic nanocorral offers new control over charged excitons and quantum light
Researchers created an electrically tunable quantum nanoscale corral that traps charged excitons and enables precise electrical control of tiny light sources, including their brightness, color and quantum states, the team, led by Boston College physicists, reports today in Nature Nanotechnology.
Researchers at Boston College have developed an electrically controllable nanoscale trap to confine charged excitons, enabling precise control over the brightness, color and quantum states of tiny light sources. The trap, created using an ultrathin, porous metal layer in a material called tungsten diselenide, holds special light-emitting particles called excitons in place while allowing others to move more freely.
This discovery, reported in Nature Nanotechnology, opens new pathways for controlling hybrid charge, photon and spin quantum states, crucial for future quantum technologies. The team created the trap by developing an electrostatic nanocorral using a nanoporous metallic layer that generates very small, focused electric fields, allowing the confinement of charged particles.
The findings were unexpected, as the project was initially aimed at studying a different effect. The researchers realized the behavior arose from a quantum confinement effect of hybrid charge–photon states, which could lead to deterministic control of nanocorral geometry and the achievement of a two-level quantum regime. This could enable single-photon sources, photon-correlation measurements and scalable architectures for quantum networking, quantum communication and quantum photonic technologies.
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