Joining the dots to boost integrated photonics

The quantum dots serve as a source of single photons, according to researchers at the University of Rochester, New York, US.

Scientists are interested in integrated solid-state devices for quantum information processing uses. Quantum dots in atomically thin semiconductors could not only provide a framework to explore the fundamental physics of how they interact, but also enable nanophotonics applications.

Quantum dots are often referred to as artificial atoms. They are artificially engineered or naturally occurring defects in solids that are being studied for a wide range of applications.

Atomically thin 2D materials such as graphene have also generated interest among scientists who want to explore their potential for optoelectronics, said University of Rochester assistant professor of optics Nick Vamivakas. However, until now, optically active quantum dots have not been observed in 2D materials.

In a paper published in Nature Nanotechnology, the Rochester researchers show how tungsten diselenide (WSe2) can be fashioned into an atomically thin semiconductor that serves as a platform for solid-state quantum dots. The defects that create the dots do not inhibit the electrical or optical performance of the semiconductor and can be controlled by applying electric and magnetic fields.