Bach, R., Pope, D., Liou, S. H., & Batelaan, H. (2013). Controlled double-slit electron diffraction. New Journal of Physics, 15(3), 033018.

http://iopscience.iop.org/1367-2630/15/3/033018/pdf/1367-2630_15_3_033018.pdf

And some movies of the interference pattern build-up :

http://iopscience.iop.org/1367-2630/15/3/033018/media

 

The famous Feynman thought experiment reproduced ! ((cf. Feynman Lectures on Physics, vol III, figures 1–3,))

 

controlled double slit electron diffraction