Effects of magnetic field on the terahertz nonlinear optical properties in donor‐doped GaAs/AlGaAs quantum wells

Abstract

Effects of the magnetic field on nonlinear optical properties at THz range in GaAs/AlGaAs quantum wells doped with donor atoms are investigated. Expressions for the third‐order nonlinear optical susceptibilities are obtained through the solution of the density matrix equations of motion within the rotating wave approximation. Donor binding energies are calculated variationally by means of an iterative shooting algorithm. Magnetic field has strong effect on the nonlinear susceptibility: it removes the degeneracy in energies of 2p± impurity states and increases the absolute value of the nonlinearity. It is also shown that a large and tunable optical nonlinear figure of merit is possible with the magnetic field applied in the growth direction. The nonlinear optical quantities are also calculated for donor distributions with different full width at half maximum values in the absence of magnetic field and the observed features at low energy part are attributed to the increasing homogeneity in the donor distribution.

Influence of Noise–Anharmonicity Interplay on a Few Physical Properties of Quantum Dots

“…The magnetic properties of LDSS are worthy of rigorous study in view of understanding the electronic magnetism in nanoscale structures which often reveals exciting physics. [22][23][24][25][26][27][28][29][30][31] Such study includes an applied magnetic field which rearranges the density of states and thereby changes the energy spectrum of the carriers. From an experimental perspective, the changed energy spectrum, in turn, changes the binding energy and serves as a means to harness the performance of optoelectronic devices.…”

Adiabatic Switching Among Quantum Dot Eigenstates: Role of Anharmonicity and Gaussian White Noise

“…External perturbations can tune the properties of LDSS‐based optoelectronic devices by desired modification of the size and shape of the effective confinement potential (ECP). These external perturbations include the magnetic field , [ 3,10,11,13,16–19,33–35 ] hydrostatic pressure (HP), [ 4,14,17,19–21,36 ] and temperature ( T ). [ 4,14,21,36 ] Anharmonicity in the confinement potential changes the properties of the confined electrons and therefore the electronic, electrical, magnetic, and NLO properties of QDs.…”

Profiles of Static Quadrupole Polarizability of Impurity‐Doped Quantum Dots Driven by Gaussian White Noise

“…The tunability increases due to the dependence of optical transition energy on the effective confinement strength . Thus, we can come across a large number of studies that deal with impurity doping in LDSS, showing special interest in nonlinear optical (NLO) properties …”

“…[4] Thus, we can come across a large number of studies that deal with impurity doping in LDSS, [5][6][7][8] showing special interest in nonlinear optical (NLO) properties. [9][10][11][12][13][14][15][16][17][18][19][20][21] Electric field (F) [22][23][24][25][26][27][28][29][30][31][32][33] and magnetic field (B) [24,28,30,[34][35][36][37] are two prominent physical quantities which are well known for providing valuable information on LDSS. The incorporation of F and B, in effect, alters the effective confinement potential of LDSS.…”