Influence of applied external fields on the nonlinear optical properties of a semi-infinite asymmetric Al Ga1−As/GaAs quantum well

Nonlinear Optical Properties of Al0.3Ga0.7As/GaAs Quantum Dots under Tunable Parameters

“…Figure 2a displays the linear optical AC α (1) (ω), the third-order nonlinear AC α (3) (ω, I), and the total AC α(ω, I) as functions of the incident photon energy, for different temperatures, with d = 10 nm, R = 3 nm, P = 5 kbar, U 0 = 8 meV. From the figure, it can be clearly seen that for each T, the α (1) (ω), the α (3) (ω, I), and the α(ω, I) as functions of the incident photon energy ħω respectively have an optical AC peak, and the optical AC peaks have the same position, due to the one-photon resonance enhancement. Besides, the linear term is positive while the nonlinear term is negative.…”

“…On the side, a very significant feature of the figure is that the optical AC peaks of the linear, the nonlinear, and the total optical AC peaks move toward the higher-energy regions as temperature T is enlarged (i.e., blueshift), this is due to the fact that the higher the T, the larger the E 12 (i.e., energy-level interval), as shown in Figure 2c. At last, it also should be noted that the absolute values of the optical AC peaks of the α (1) (ω), α (3) (ω, I), and α(ω, I) slowly increase with the enlargement of T, which is because the matrix element increases as the temperature increases, causing the optical AC peaks of the absolute values of the three coefficients to increase. In addition, it can be seen from Equation ( 10) and ( 11) that α (3) (ω, I) is proportional to |M 12 | 4 and α (1) (ω) is proportional to | M 12 | 2 , so the peak value does increase when the matrix element increases.…”

“…At last, it also should be noted that the absolute values of the optical AC peaks of the α (1) (ω), α (3) (ω, I), and α(ω, I) slowly increase with the enlargement of T, which is because the matrix element increases as the temperature increases, causing the optical AC peaks of the absolute values of the three coefficients to increase. In addition, it can be seen from Equation ( 10) and ( 11) that α (3) (ω, I) is proportional to |M 12 | 4 and α (1) (ω) is proportional to | M 12 | 2 , so the peak value does increase when the matrix element increases.…”

“…Compared with 3D semiconductor materials, low-dimensional confined semiconductor materials exhibit higher electron mobility and higher carrier concentration, which make them advantageous in high-current density applications. [1][2][3][4][5] In addition, lowdimensional semiconductors have lower resistance, which makes them equally advantageous in power electronics applications. [6][7][8][9] As a low-dimensional semiconductor nanomaterial, the nonlinear optical absorption of quantum dots (QD) refers to the process in which light energy is absorbed by QDs and converted into electron-hole pairs under nonlinear excitation conditions.…”

Optical Second Harmonic Generation in GaAs/Ga1−xAlxAs Quantum Dots with Screened Kratzer Potential

“…The solution of Schrödinger equation is the eternal hot spot of microcosmic system and the primary problem of quantum technology. [1][2][3] The specific form of wave function and corresponding energy level can be obtained by solving the Schrodinger equation under different limiting potentials, so as to understand the properties of the system. [4][5][6] The Schrödinger equation under certain conditions is the premise to solve many problems.…”