Free Electron Fermi Gas Kittel Ch

Solid State Theory

Length: Bohr radius a B = ~2=me2 ˇ0:5 10 10m Energy: Hartree e2=a B = me4=~2 = mc2 2 ˇ27eV = 2Ry with the ne structure constant = e2=~c= 1=137.The energy scale of one Hartree is much less than the (relativistic) rest mass of an electron (˘0:5MeV), which in turn is considered small

  States, Theory, Solid, Electron, Solid state theory