Please try to give a very simple note on topological insulator which may bear information related to the theory, band-gap structure and most importantly application/use etc. of topological insulator.
This Physics world article by C. Kane and J. Moore explains in very simple terms what is topological insulator. http://www.physics.upenn.edu/~kane/pubs/p69.pdf
The following review articles are also good introduction (not too technical though) to TIs:
This Physics world article by C. Kane and J. Moore explains in very simple terms what is topological insulator. http://www.physics.upenn.edu/~kane/pubs/p69.pdf
The following review articles are also good introduction (not too technical though) to TIs: