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Honolulu, Hawaii, United States, 2006/08/16 - Individual quantum dots (QDs) have been widely investigated for the past 15 years, showing their potential applications in quantum computing.
However, individual QDs are not enough for practical applications, but preparing and characterizing groups of QDs with controllable crosstalk (quantum dot molecule) is very challenging still. University of Arkansas researchers discovered a simply way to fabricate QD pairs, the most simple QD molecule. This provides a unique opportunity to study carrier interaction among QDs, one step further towards quantum computing.
Professors Zhiming Wang and Gregory Salamo, who lead the the molecular-beam-epitaxy (MBE) group at the University of Arkansas, together with co-authors Kyland Holmes, Yuriy I. Mazur and Kimberly A. Ramsey report their most recent findings in an article titled "Self-organization of quantum-dot pairs by high-temperature droplet epitaxy" published online on July 25, 2006 in the new, free-access publication Nanoscale Research Letters.
"Self-assembly of epitaxial semiconductor nanostructures has been an intensive field of research" Wang explains to Nanowerk. "In particular, the Stranski-Krastanov (SK) growth mode based on the use of lattice-mismatched materials has played an important role in the formation of nanostructures, the investigation of quantum confinement effects, and has made possible applications of nanostructures."
In parallel, an alternative approach for the growth of nanostructures, called "droplet epitaxy" was developed. This is the method used by the researchers at the University of Arkansas, whereby liquid metal droplets are first formed as an intermediate growth step before being converted into semiconductor nanostructures.
Read the full article on the Nanowerk website.
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By Michael Berger, Copyright 2006 Nanowerk LLC.