Figure 9From: Donor impurity-related linear and nonlinear intraband optical absorption coefficients in quantum ring: effects of applied electric field and hydrostatic pressureGround and first excited states. Ground and first excited state energies of the electron (colored lines) as functions of the height of the QR L. The calculations are for R1 = 10 nm, R2 = 20 nm, F = 0, and P = 0. The impurity is placed at z i = 0 and ρ i = (R1 + R2)/2. The inset shows the corresponding energy difference between the 2s and 1s states.Back to article page