Effect of light polarization on the electromagnetically induced transparency and birefringence in a cylindrical quantum dot with spin–orbit interaction

Argani, Hassan; Raki, Zahra

doi:10.1016/j.spmi.2014.03.033

Cited by 13 publications

(6 citation statements)

References 14 publications

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“…where If, however, γ 31 = γ 21 as they were taken in many theoretical papers [30][31][32][33][34][35][36][37][38][39][40], we obtain Γ = γ 21 , Ω ref = 0. Therefore ∆ ± p = iγ 21 ± Ω c and equation ( 17) can be written as:…”

Section: Transparency Induced Through Autler-townes Splittingmentioning

confidence: 99%

“…Because we are interested to treat in an unitary way all possible configurations of three levels that allow transparency in our quantum ring and also the switch between them at given magnetic field values, we specifically work in the ATS regime to ensure the transparency for the V configurations. We consider that the transparency is good and the ATS phenomenon has occurred if the following condition is respected [30,33,40]:…”

Section: Transparency Induced Through Autler-townes Splittingmentioning

confidence: 99%

“…In semiconductor nanostructures, EIT has been experimentally demonstrated in quantum wells [22][23][24][25][26][27] and InGaAs quantum dots [28,29]. Many theoretical papers investigated EIT occurrence in quantum wells [30,31], dots [32][33][34][35][36][37][38] and rings [39][40][41]. However, these theoretical studies treated on the influence of the external fields, temperature and pressure on the transparency window making no difference between EIT and ATS regimes, even though they worked with a rather strong coupling field.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic field controlled induced transparency by Autler–Townes splitting in pseudo-elliptic quantum ring

2019

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We theoretically investigated the effects of magnetic field and of the parameters of control and probe lasers on the transparency induced through Autler-Townes splitting (ATS) in GaAs/GaAlAs pseudo-elliptic quantum ring. We showed that if equal decay rates are considered the investigation of the electromagnetically induced transparency phenomenon can be done only in the strong coupling regime. Our study reveals that the quantum system is in a Λ configuration in the absence of external fields but, in the presence of the magnetic field, it may present simultaneously many configurations (of Λ, Ξ and V type) that allow the occurrence of transparency, separated by very narrow regions of magnetic fields where no configuration is active. The magnetic field determines almost periodically the switch between configurations. We demonstrated that in V (Ξ) configurations the ATS requires the greatest (lowest) intensity of the control laser and of the energy of the probe laser.

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Section: Transparency Induced Through Autler-townes Splittingmentioning

confidence: 99%

Section: Transparency Induced Through Autler-townes Splittingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetic field controlled induced transparency by Autler–Townes splitting in pseudo-elliptic quantum ring

2019

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“…6 It is due to three-dimensional confinement of charge carriers in semiconductor QDs which results in quantization of energy levels that extremely depends on shape and size of QDs. 7,8 Therefore, many researchers focused on dependency of physical properties on QDs' shapes such as cubic, 9 ellipsoidal, 10 cylindrical, 11 pyramid, 12 spherical 13 and tetrahedral QDs. 14 Besides QDs, semiconductor nanowires are one-dimensional nanoscale building blocks that have been the subject of extensive study because they are required to interconnect functional units in nanoelectronics.…”

Section: Introductionmentioning

confidence: 99%

The binding energies of an off-center hydrogenic donor impurity in a GaAs/GaAlAs nanowire superlattice: Comparison between spherical and cylindrical wells

Safarpour

Novzari

Izadi

et al. 2015

Int. J. Mod. Phys. B

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In this paper, the effect of an off-center donor impurity on electronic structure of nanowire superlattices (NWSLs) is numerically studied using finite difference (FD) approximation. Energy levels and binding energies of ground and first excited states (1s and 2p) are computed for two different NWSL with circular cross-section which involved an array of spherical or cylindrical quantum dots (QDs) along their axis which are called Sph and Cyl NWSLs, respectively. The numerical results show that oscillatory behaviors appear in electronic energy levels and binding energies as impurity shifts away from the center of QDs. Maximum values of ground state binding energies occur when impurity is located at the center of QDs and these values shift towards higher energies as number of unit cells of NWSL decreases. An opposite behavior is observed for first excited state as impurity shifts away from the center of QDs. Also, as the QDs' volumes increase binding energies (i) decrease, (ii) increase, (iii) decrease, reach minimum values and then increase, or (iv) increase, reach maximum values and then decrease; which strongly depend on the type of NWSL, position of impurity and number of unit cells involved * Corresponding author. 1550085-1Gh. Safarpour et al.in NWSLs. Additionally, it is found that binding energies of Sph NWSL are larger than those of Cyl NWSL.

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“…Detailed studies of the EIT can be found in refs. [36][37][38][39][40] where the effects of light polarization, hydrostatic pressure, temperature, applied magnetic field, parabolic confinement potentials, V-and Λ-type configurations for the involved energy levels, and spin-orbit interaction have been considered. Again, the presence of asymmetries in heterostructures is responsible for the magnification of EIT effect.…”

mentioning

confidence: 99%

Donor impurity related optical and electronic properties of cylindrical GaAs-AlxGa1−x As quantum dots under tilted electric and magnetic fields

Heyn

Duque

2020

Sci Rep

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this article makes a theoretical study of the optical and electronic properties in cylindrical GaAs-Al x Ga 1−x As quantum dots in the presence of an arbitrarily located donor impurity and considering the simultaneous effects of tilted electric and magnetic fields. The studies are developed in the effective mass and parabolic band approximations. the solution of the Schrödinger equation is done through the finite element method considering tetrahedral meshes that can be adapted to regions where there are abrupt variations of the materials that make up the structure. Among the many results, reported for the first time in this article, we can mention: (i) the electronic spectrum, without and with shallow donor impurity, considering separate and combined effects of tilted electric and magnetic fields, (ii) the ground state binding energy as a function of the external electric and magnetic fields, their orientations concerning the axial axis of the quantum dot, and the impurity position, (iii) the squared reduced dipole matrix elements for impurity related inter-level optical transitions as a function of the tilted electric and magnetic fields and impurity position, and (iv) the optical absorption coefficient between the ground state and at least the first fifteen lowest excited states under tilted electric and magnetic fields and considering several impurity positions. From this study it can be concluded that the presence of tilted electric and magnetic fields and on-center or off-center shallow donor impurities, ostensibly enrich the optical and electronic properties of the system. It is observed that due to the rupture of the azimuthal symmetry of the cylindrical quantum dot, important modifications of the selection rules for inter-level transitions between states appear.

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Effect of light polarization on the electromagnetically induced transparency and birefringence in a cylindrical quantum dot with spin–orbit interaction

Cited by 13 publications

References 14 publications

Magnetic field controlled induced transparency by Autler–Townes splitting in pseudo-elliptic quantum ring

Magnetic field controlled induced transparency by Autler–Townes splitting in pseudo-elliptic quantum ring

The binding energies of an off-center hydrogenic donor impurity in a GaAs/GaAlAs nanowire superlattice: Comparison between spherical and cylindrical wells

Donor impurity related optical and electronic properties of cylindrical GaAs-AlxGa1−x As quantum dots under tilted electric and magnetic fields

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