Interference of Thermal Electron Wavepackets
E.J. Heller and R.M. Westervelt
A thermal wavepacket has been sent from below, spreading out and bouncing against the
two mirrors shown in the right and left portions of the image.
After one bounce from the farther mirror, and two from the closer
one, parts of the wavepacket are arriving at the same time back
at the QPC. By moving the mirror slightly (about 1/4 of a deBroglie
wavelength) the resulting interference from the two paths goes
from destructive (left, less flux seen going down) to constructive
(right, more flux going down).