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O-D GaAs based QDs compete with 3-D

Zero-dimensional gallium arsenide based quantum dots may someday have a big effect on solar energy and lasers
In physics, there's small, and then there's nullity classed as zero-dimensional.

University of Cincinnati researchers have reached this threshold with a special structure that may one day lead to better ways of harnessing solar energy, stronger lasers or more sensitive medical diagnostic devices.



UC student Teng Shi will present her semiconductor nanowire research at the American Physical Society meeting

These structures are GaAs/AlGaAs semiconductor nanowires.

UC doctoral student Teng Shi says she and a team of researchers have observed unique optical signatures indicating that electronic excitations within these nanowires can be confined to a zero-dimensional state called a 'quantum dot'.

This latest discovery is all about going small, but its significance is anything but. The research team’s ability to control the confinement energy by varying the size of the quantum dot opens up a world of possibilities.

"Exploring the basic physics of semiconductor nanowires enables one to envision applications or to design structures for applications," says Shi of UC's Department of Physics. "These structures are potential candidates for a variety of applications including photovoltaics, lasers and ultra-sensitive nanosensors." 

Shi will present the team's research "Temperature-dependent Photoluminescence Imaging of GaAs/AlGaAs Heterostructure Quantum Well Tubes" at the American Physical Society (APS) meeting to be held March 3rd to 7th in Denver.

Nearly 10,000 professionals, scholars and students will attend the APS meeting to discuss new research from industry, universities and laboratories from around the world.

This research advances work previously done on semiconductor nanowires at UC. By using a thin shell called a quantum well tube and growing it - to about 4 nanometres thick - around the nanowire core, researchers found electrons within the nanowire were distributed in an unusual way in relation to the facets of the hexagonal tube. The result is a quantum wire, like a long string many times thinner than a human hair.

Now they've taken things further, going from one-dimensional wires to zero-dimensional quantum dots. These little structures made using GaAs based materials could have a big effect on a variety of technologies.

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