Linear and nonlinear optical properties of GaAs/AlxGa1−xAs/GaAs/AlyGa1−yAs multi-shell spherical quantum dot

Abstract

In this work, the optical properties of GaAs/AlxGa1−xAs/GaAs/AlyGa1−yAs multi-shell quantum dot heterostructure have been studied as a function of Al doping concentrations for cases with and without a hydrogenic donor atom. It has been observed that the absorption coefficient strength and/or resonant absorption wavelength can be adjusted by changing the Al content of inner-barrier and/or outer-barrier regions. Besides, it has been shown that the donor atom has an important effect on the control of the electronic and optical properties of the structure. The results have been presented as a function of the Al contents of the inner-barrier x and outer-barrier y regions and probable physical reasons have been discussed.

Quantum size effect on the electronic transitions of GaAs/AlGaAs dots under twisted light

“…From our previous works and other studies in literature, we know that the change in the size and geometry of the quantum dots leads to the change in the confinement of the particles and the variation of corresponding transition probabilities [29][30][31][32][33][34][35]. As well known, the change in geometry and size is not sufficient and sometimes expensive to obtain different band gaps or to succeed required electronic transitions.…”

Calculation of Zeeman splitting and Zeeman transition energies of spherical quantum dot in uniform magnetic field

“…In recent years, QDs have been extensively studied due to their potential applications in high performance devices. Therefore, a great deal of works have been performed on the electronic structures [2][3][4][5][6][7], binding energies [8][9][10][11], spin effects [12][13][14][15] and optical properties [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] of QDs with different shape, size and the confinement potential by using various methods.…”

Linear and nonlinear absorption coefficients of spherical two-electron quantum dot

“…Therefore, many authors have studied the binding energies, the effects of electric and magnetic field and other physical properties of oneelectron QD with various size and shapes [1][2][3][4][5][6]. In one-electron QDs, linear and nonlinear absorption coefficients have attracted the attention of researchers both experimentally and theoretically [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25], because QDs have the potential for the device applications such as farinfrared photodetectors, laser amplifiers(wavelength 10m), optical memories, light emitting diodes and high-speed electrooptical modulators [26][27][28].…”