Impurity related optical properties in tuned quantum dot/ring systems

Energy states, oscillator strengths and polarizabilities of many electron atoms confined by an impenetrable spherical cavity

“…Technologically, QDs have many potential applications in microelectronic and optoelectronic devices. In this respect, by employing different approaches and potential shapes, many researchers have studied the electronic structure [2–5], binding energies [6–8], optical properties [9–15], electric and magnetic field effects [16–25], and other physical properties [26–30] of single electron QDs. As well known, it is easy to obtain analytical solutions for single electron QDs.…”

Energy states, oscillator strengths and polarizabilities of many electron atoms confined by an impenetrable spherical cavity

“…Technologically, QDs have many potential uses in microelectronic and optoelectronic devices. In this respect, by employing different approaches and potential shapes, some researchers have studied the electronic structure, [2][3][4][5] binding energies, [6][7][8] optical properties, [9][10][11][12][13][14][15] electric and magnetic field effects, [16][17][18][19][20][21][22][23][24][25] and other physical properties [26][27][28][29][30] of single electron QDs. As well known, it is easy to obtain analytical solutions for QDs with one electron.…”

Exact Solutions for a Quantum Ring with a Dipolar Impurity

“…With the immense technological advancement in nano-processing, new beings appear in low dimensional systems like quantum dots (QD) which can be regarded as low-dimensional heterostructures whose carriers are confined in all spatial dimensions [4]. Their manufacturing techniques make it possible to control their properties and thus they are made in such a way that they acquire the same characteristics of atomic systems; this is why they are sometimes called artificial atoms [4,5]. The confinement potential in QD may originate from various physical effects and possesses different symmetries in different nano-structures and the knowledge of realistic profile of confinement potential is necessary for a theoretical description of the electronic properties of QDs and, more importantly, for fabrication of nano-devices [5].…”

“…Their manufacturing techniques make it possible to control their properties and thus they are made in such a way that they acquire the same characteristics of atomic systems; this is why they are sometimes called artificial atoms [4,5]. The confinement potential in QD may originate from various physical effects and possesses different symmetries in different nano-structures and the knowledge of realistic profile of confinement potential is necessary for a theoretical description of the electronic properties of QDs and, more importantly, for fabrication of nano-devices [5]. Since a long time, the pseudoharmonic oscillator (PHO) is used to study these compounds and recently it was found to be one of those that best correspond to QDs [6] (and the references therein).…”

“…If we consider that the donor impurity is not ionized, the dipole is the first term in this expansion since there is no Coulomb (monopolar) contribution in this case. Our choice here adds a new case to that of the usual Coulomb impurities [5,7,23,24,25,26,27,28].…”