University of Minnesota
University Relations

Minnesota Supercomputing Institute

Log out of MyMSI

Research Abstracts Online
January 2009 - March 2010

Main TOC ....... College TOC ....... Next Abstract

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

PI: Traian Dumitrica, Associate Fellow

Atomistic Dynamics Simulations of Mechanical and Optical Nanoscale Phenomena

This project researches the possibility of controlling the optic response in quantum dots by altering shapes. If successful, it 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. These researchers are using ab initio simulations as a powerful alternative investigation method. If the calculations indicate the possibility of altering the gap states by shape changes in a variety of symmetries, especially in ones currently encountered in experiments, the result will guide experimental efforts and transform 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, Graduate Student
Dong-Bo Zhang, Graduate Student
Houlong Zhang, Graduate Student