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Research Abstracts Online
January 2008 - March 2009

University of Minnesota Twin Cities
Institute of Technology
Department of Mechanical Engineering

PI: Traian Dumitrica, Associate Fellow

Optical Properties of Silicon Quantum Dots

This project researches the possibility of controlling the electronic states in a silicon quantum dot by altering shapes. If successful, this will indicate a viable alternative to the more researched method of doping with impurities. Comprehensive experimental studies on the effects of shape changes on optical response of Si QDs are difficult and quantitative results are limited. Thus, these researchers are using ab initio simulations as a powerful alternative investigation method. If their calculations indicate the possibility of altering the gap states by shape changes in a variety of symmetries, especially in ones currently encountered in experiments, this result will be of tremendous importance for guiding experimental efforts and ultimately transforming the shape modulation effect into a viable alternative to doping. For certain applications, this new possibility could be even more attractive than doping because the aspect ratio changes could lead to the emission of polarized light.

Group Members

Evgeniya Akatyeva, Graduate Student
Ilia Nikiforov, Undergraduate Student
Dong-Bo Zhang, Graduate Student
Houlong Zhang, Graduate Student