shown in Figure . The selection function @f /@E, which peaks at the Fermi energy E F (Figure ), samples ⌃(E) in both bands, resulting in contributions from both bands to the transport coe cients (Figure ), S (Figure ), and  e (Figure ) by Eq. (2). Since the transport coe cients depend on E F , it is convenient to define a reduced Fermi energy for each band separately. If we reference the Fermi energy to the conduction band minimum i.e., E F = 0, then the reduced Fermi energy of electrons (⌘) and holes (⌘ h ) are given by,