Optical properties in a two-dimensional quantum ring: Confinement potential and Aharonov–Bohm effect

Liang, Shi‐Jun; Xie, Wenfang; Shen, Huaya

doi:10.1016/j.optcom.2011.08.080

Cited by 37 publications

(8 citation statements)

References 77 publications

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“…In light of these basic developments, the AB effect on optical properties of low‐dimensional semiconductor structures has been researched . In the presence of an external magnetic field and AB magnetic flux, total refractive index changes (TRICs) and total absorption coefficients (TACs) of a two‐dimensional quantum ring with pseudopotential encompassing have been investigated, in which response to optical properties of AB oscillations has been clearly elucidated. The effects of AB oscillations on TRICs and TACs in the HgS quantum shell have been viewed within the effective mass approach and diagonalization method .…”

Section: Introductionmentioning

confidence: 99%

Magneto‐optical specifications of Rosen‐Morse quantum dot with screw dislocation

Bahar

Ungan

2020

Int J of Quantum Chemistry

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This is the first study to consider a quantum dot with screw dislocation that has Rosen-Morse (RM) confinement potential, generated by a GaAs/GaAlAs heterostructure.An external magnetic field and Aharonov-Bohm (AB) flux field were also applied on RM quantum dot (RMQD) in order to stave the effects of a screw dislocation defect. The combined effect of the screw dislocation defect, the external magnetic field, and AB flux field on the total refractive index changes (TRICs) and the total absorption coefficients (TACs) of RMQD are thus investigated. Cylindrical coordinates are used due to the direction of application of the torsion and the external fields, as well as due to the structure's symmetry. The effective mass approximation and tridiagonal matrix methods are used in order to obtain the subband energy spectra and electronic wave functions of RMQD.The nonlinear optical specifications of RMQD are checked using compact-density-matrix formalism within the framework of the iterative method. Reviews without screw dislocation are also carried out in order to be able to clarify the effects of a screw dislocation defect on the optical properties, and then, both cases are deliberated. This study is the first attempt to analyze the AB flux field for RMQD without screw dislocation. In the present study, the influences of a screw dislocation defect on RMQD's TRICs and TACs are probed by considering different values of the external magnetic field and AB flux field, and the ranges of corresponding parameters on the optimum of the structure are specified. Moreover, the study also elucidates how to rule out the effects of screw dislocation on optical specifications by means of the external fields. Despite a certain screw dislocation, the frequency range is determined where the structure behaves as if it is perfect (namely, without screw dislocation) for its optimum, which in turn is crucial for experimental applications. K E Y W O R D SAharonov-Bohm flux field, magnetic field, nonlinear optical properties, quantum dot, screw dislocation, Rosen-Morse (RM) confinement potential

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Section: Introductionmentioning

confidence: 99%

Magneto‐optical specifications of Rosen‐Morse quantum dot with screw dislocation

Bahar

Ungan

2020

Int J of Quantum Chemistry

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“…So far, many investigations have been done on second and third harmonic generations in quantum dots, quantum wells and quantum wires. [28][29][30][31] For example, Sauvage et al 32 observed THG associated with intraband transitions in semiconductor quantum dots. Wang 33 studied the THG in cylindrical parabolic quantum wires with an applied electric field.…”

Section: Introductionmentioning

confidence: 99%

The energy levels, binding energy and third harmonic generation of a hexagon-shaped quantum wire

Khordad

Bahramiyan

2015

Mod. Phys. Lett. B

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In this paper, we have studied the effect of impurity on the energy levels and nonlinear optical properties of a hexagon-shaped quantum wire using finite element method (FEM). We have obtained the energy eigenvalues, their corresponding eigenfunctions and third harmonic generation (THG) with and without impurity for different sizes of inner a 1 and outer a 2 hexagons. It is found that all energy levels are decreased with increasing a 1 . There is degeneracy between energy levels without impurity. But, there is no degeneracy between the energy levels in the presence of impurity. The dipole matrix elements are increased with enhancing hexagon sizes without impurity. But, these elements have complex behaviors with impurity. The THG increases and shifts toward lower energies by enhancing a 1 . The influence of a 2 /a 1 on THG is not large when a 2 /a 1 > 2. The THG shifts toward lower energies by increasing impurity position.

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“…Recently, a number of researchers have done theoretical researches on nonlinear optical properties 36,[38][39][40][41][42][43][44]. These researches show that compared to in bulk materials, the strong quantum confinement effects in low-dimensional semiconductor quantum systems will greatly improve nonlinear optical effects.…”

Section: Introductionmentioning

confidence: 99%

“…Their works show how to fabricate the pseudoharmonic potential and give some basic properties about the system. Based on their works, much work about the pseudoharmonic potential has been done by some other researchers [38][39][40][41][42][43][44]. For example, Rezaei et al investigated intersubband optical absorption coefficient changes and refractive index changes optical rectification coefficient in the pseudoharmonic potential system [38,39].…”

Section: Introductionmentioning

confidence: 99%

“…Yu studied third-harmonic generation in the two-dimensional pseudoharmonic potential system with an applied magnetic field [43]. Liang and Xie discussed optical properties in the two-dimensional pseudoharmonic potential quantum ring: confinement potential and Aharonov-Bohm effect [44]. All these researches show that the nonlinear optical properties in pseudoharmonic potential indeed have novel effects.…”

Section: Introductionmentioning

confidence: 99%

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

Liu

Guo

Hassanabadi

et al. 2013

Physica B: Condensed Matter

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Optical properties in a two-dimensional quantum ring: Confinement potential and Aharonov–Bohm effect

Cited by 37 publications

References 77 publications

Magneto‐optical specifications of Rosen‐Morse quantum dot with screw dislocation

Magneto‐optical specifications of Rosen‐Morse quantum dot with screw dislocation

The energy levels, binding energy and third harmonic generation of a hexagon-shaped quantum wire

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

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