An Introduction to Mesoscopic and Nanometer Scale Physics (PDF)

Interference of electrons
When we let both slits be open, and measure the probability distribution, we
find that it looks like what is shown below, which is very similar to the
probability distribution for a wave. Hence, although the electrons appear to
arrive as particles, in one single “lump” which contains the entire electron, the
final distribution pattern looks very similar to what we found for the intensity
of a wave. Hence the electrons appear to have both particle like and wave like
properties.
P 12 ≠ P 1 + P 2
P 1
P 2
P 1,2
electron
gun
1
y
2