Figure 2.

a Profile of a QW conduction band with a ES-shielded polarization field for characteristic shielding distance (Debye length) λ_D = 8L, L/2, L/6, L/10, L/20, longer to shorter dash lines. b Energy correction (meV) versus L/λ_D, for the lowest five QW modes with V_o = 25 meV and QW width L = 8 nm. c Same versus carrier density N corresponding to λ_D