Exciton-related nonlinear optical properties in cylindrical quantum dots with asymmetric axial potential: combined effects of hydrostatic pressure, intense laser field, and applied electric field

Abstract

The exciton binding energy of an asymmetrical GaAs-Ga1−xAlxAs cylindrical quantum dot is studied with the use of the effective mass approximation and a variational calculation procedure. The influence on this quantity of the application of a direct-current electric field along the growth direction of the cylinder, together with that of an intense laser field, is particularly considered. The resulting states are used to calculate the exciton-related nonlinear optical absorption and optical rectification, whose corresponding resonant peaks are reported as functions of the external probes, the quantum dot dimensions, and the aluminum molar fraction in the potential barrier regions.

Effects of applied electric fields on optical responses in elliptical quantum nanosystems

“…On the other hand, the nonlinear optical properties of QD structures have also been considered quite extensively in the literature (see, for instance, , and references therein). Actually, it is not possible to underrate the importance of the study of the optical responses in these quantum nanosystems.…”

“…In particular, the finite element method (FEM) allows for solving the quantum mechanical problem of finding the allowed carrier states in all spatial dimensions and in the cases where the geometry of the system shows irregularities or symmetries that cannot be treated analytically [20]. On the other hand, the nonlinear optical properties of QD structures have also been considered quite extensively in the literature (see, for instance, [21][22][23][24][25][26][27][28], and references therein). Actually, it is not possible to underrate the importance of the study of the optical responses in these quantum nanosystems.…”

Effects of external fields, the hydrostatic pressure and temperature on the electronic Raman scattering of a hydrogenic impurity in a two-dimensional parabolic quantum dot

“…There has been extensive work devoted to investigate the influence of these aspects on the electronic structure and optical properties of semiconductor QDs [30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55].…”

A theoretical study of nonlinear optical absorption and refractive index changes with the three-dimensional ring-shaped pseudoharmonic potential

“…In the researches above, changing the shapes and sizes of quantum systems is often used to do researches on nonlinear optical effects. For example, cubic [3,4], spherical [5][6][7][8], diskshaped [9][10][11][12], cylindrical [13][14][15], ring [16] quantum dots are studied by some researchers. Besides, there are many physical factors that have great influences on nonlinear optical effects.…”

“…Therefore, some authors do some researches by adding the number of electrons such as two electrons [9,17,18] and consider polaron [13,[19][20][21] and excitonic [22][23][24] effects. Moreover, the application of an electric field [14,16,18,25], a magnetic field [12,13,26], impurity [10,16,25], spin-orbit interaction [4,27] and external perturbation like hydrostatic pressure [14,16], temperature [14,16] and intense laser field [14,28,29], exhibits novel nonlinear optical phenomena. Besides, changing the confinement potential in quantum structures is a very useful method.…”