From a team of City College of New York physicists and their collaborators in Japan and Germany comes another advancement in the study of excitons -- electrically neutral quasiparticles that exist in insulators, semi-conductors and some liquids. The researchers are announcing the creation of an "excitonic" wire, or one-dimensional channel for excitons. This in turn could result in innovative devices that could one day replace certain tasks that are now performed by standard transistor technology.
Florian Dirnberger, post-doc in Vinod Menon's research group in CCNY's Center for Discovery and Innovation, and one of the lead authors of the study that appears in the journal Science Advances, detailed the team's breakthrough. "Our main achievement was to manage to create these excitonic wires, essentially one-dimensional channels for excitons, in what is otherwise a two-dimensional semiconductor," he said. "Since charge neutral excitons are not simply controlled by external voltages, we had to rely on a different approach. By depositing the atomically thin 2D crystal on top of a microscopically small wire, a thousand times thinner than a human hair, we created a small, elongated dent in the two-dimensional material, slightly pulling apart the atoms in the two-dimensional crystal and inducing strain in the material. For excitons, this dent is much like a pipe for water and once trapped inside, they are bound to move along the pipe, realizing quasi one-dimensional transport of excitons."
This advancement holds possibilities for new devices.
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