- #1
Niles
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Hi
The group velocity of an electron wavepacket in a homogeneous lattice is
vgroup(k) = ∇kEk,
where Ek is the dispersion. I have just read an article, where they use this to find the group velocity of a wavepacket in an inhomogeneous lattice, but they use the homogeneous dispersion. I don't quite understand why this is allowed. Can you clarify this?
Niles.
The group velocity of an electron wavepacket in a homogeneous lattice is
vgroup(k) = ∇kEk,
where Ek is the dispersion. I have just read an article, where they use this to find the group velocity of a wavepacket in an inhomogeneous lattice, but they use the homogeneous dispersion. I don't quite understand why this is allowed. Can you clarify this?
Niles.