- #1
Petar Mali
- 290
- 0
For [tex]k_D<<k_F[/tex]
[tex]|\frac{\hbar^2k^2_F}{2m}-\frac{\hbar^2k^2}{2m}|\approx \frac{\hbar^2k_F}{m}|k_F-k|[/tex]
Where [tex]k[/tex] goes from [tex]k-k_D[/tex] to [tex]k+k_D[/tex]
[tex]k_F[/tex] - Fermi wave vector
[tex]k_D[/tex] - Debay wave vector
[tex]|\frac{\hbar^2k^2_F}{2m}-\frac{\hbar^2k^2}{2m}|\approx \frac{\hbar^2k_F}{m}|k_F-k|[/tex]
Where [tex]k[/tex] goes from [tex]k-k_D[/tex] to [tex]k+k_D[/tex]
[tex]k_F[/tex] - Fermi wave vector
[tex]k_D[/tex] - Debay wave vector