Hi, Ok, so let's say we have a non-degenerate n-type semiconductor such that the Fermi-level/chemical potential is somewhere in the bandgap (probably needs to be low temperature). Typically in a metal you would say that the Fermi velocity is [tex]\hbar k_F/m_e[/tex]. But since the Fermi-energy is below the conduction band, that doesn't seem to make sense. My thought would be that since we are at a non-zero temperature, there are some conduction electrons from the donors simply due to thermodynamics. So my thought would be to find the conduction electron density due to thermalized donors and use that as [tex]n_c[/tex] and then use the standard expressions for Fermi wavevector and Fermi velocity. What do you think? Thanks.