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    COLLOQUIUM OF THE LABORATORY FOR COMPUTER DESIGN OF MATERIALS
        Institute for Computational Sciences and Informatics
	                      CSI 898-Sec 001  
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         Tight-binding recursion methods: applications to 
                   semiconductor microstructures

			   Marco Fornari
                   George Mason University and
Center for Computational Materials Science, Naval Research Laboratory           

Results on the electronic structure of GaAs/AlAs and HgTe/CdTe 
quantum wells and super-lattices (SL) are presented to demonstrate 
that tight-binding (TB) methods provide an efficient and physically 
transparent tool to treat semiconductor microstructures with 
large unit cells.  Emphasis is given to numerical methods based 
on Green function renormalization and Lanczos iterative projection 
approaches.  For GaAs/AlAs SL's, comparison between calculations 
and optical measurements illustrates the reliability of TB methods 
to predict and interpret physical effects in semiconductor 
microstructures. 

	                 Monday , April 5 1999
                                 4:30 pm
                        Room 206, Science & Tech. I

Refreshments will be served.
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(http://www.csi.gmu.edu/lcdm/seminar/schedule.html)