- #1
daudaudaudau
- 302
- 0
Hello!
If one uses the Lindhard formula to calculate the static polarizability of an electron gas, [itex]\chi(q)[/itex], you get a function which is pretty much a constant until [itex]q=2k_F[/itex] with [itex]k_F[/itex] being the Fermi wave vector. After this it decays(it's on page 335 of Ashcroft and Mermin). But what is the interpretation of this? Somehow short wavelengths are not screened very well?
If one uses the Lindhard formula to calculate the static polarizability of an electron gas, [itex]\chi(q)[/itex], you get a function which is pretty much a constant until [itex]q=2k_F[/itex] with [itex]k_F[/itex] being the Fermi wave vector. After this it decays(it's on page 335 of Ashcroft and Mermin). But what is the interpretation of this? Somehow short wavelengths are not screened very well?