Wave-packets with opposite momenta.

[alemsalem]

Is it possible to prepare a particle with a wave-packet having momenta in opposite directions,
so that you have two localized packets moving away from each other (for a single particle)?

 

[The_Duck]

Sure. Send a particle at a potential barrier with a height and width such that the particle has some probability to tunnel through, and some probability to be reflected. After encountering the barrier, a portion of the particle's wave function will be on the other side of the barrier traveling in the original direction, while a different portion will be moving away from the barrier opposite the original direction of motion, having been reflected.

 

[omkatariya]

is phase velocity of electron in microwave sense is greater than speed of light?

 

[omkatariya]

please solve my problem...
is phase velocity of electron is greater than speed of light.?

 

[omkatariya]

i think its very complicated things..

 

[alemsalem]

its not higher than the speed of light, I think its half the particle's velocity (group velocity)

Vphase = (h*omega)/(h k) = (p^2/2m)/p = p/2m = v/2 roughly speaking..