Impurity-related linear and nonlinear optical response in quantum-well wires with triangular cross section

Duque, C.A.; Mora-Ramos, M.E.; Kasapoğlu, E.; Ungan, F.; Yesilgül, U.; Şakiroğlu, S.; Sarı, H.; Sökmen, I.

doi:10.1016/j.jlumin.2013.04.048

Cited by 78 publications

(27 citation statements)

References 51 publications

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“…(1)) sensibly represents a 2-d quantum dot with a single carrier electron [47,48]. The form of the confinement potential conforms to kind of lateral electrostatic confinement (parabolic) of the electrons in the x-y plane [2,13,20,27,49].…”

Section: Methodsmentioning

confidence: 99%

“…Under the confinement, the dopant location can tailor the electronic and optical properties of the system. This resulted to a wealth of important investigations on impurity states [2][3][4][5][6][7][8][9][10][11][13][14][15] in general, and also on their optoelectronic properties, in particular, for a wide variety of semiconductor devices [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. The research trend sheds light on new device physics mingled with profound technological impact.…”

Section: Introductionmentioning

confidence: 99%

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Influence of noise shape on excitation kinetics of impurity doped quantum dots

Pal¹,

Sinha

Ganguly³

et al. 2014

Manufacturing Review

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-Noise influences the functioning of nanomaterials and optoelectronic materials to a significant extent. We investigate the excitation kinetics of a repulsive impurity doped quantum dot initiated by the application of external white noise with special reference to noise shape. We have exploited white noise of Gaussian and Lorentzian shapes. The said shapes in effect alter the range of spatial correlation of the white noise. We have considered both additive and multiplicative noise (in Stratonovich sense). In conjunction with the shape, the noise strength and the dopant location also fabricate the kinetics in a delicate way. Moreover, the influences of additive and multiplicative nature of the noise on the excitation kinetics have been observed to be prominently different. Interestingly as well as surprisingly enough, in case of additive noise, the noise strength does not affect the kinetics. The investigation reveals that the Lorentzian shape invites more diversities in the excitation kinetics when noise strength and dopant location are varied over a range than the Gaussian one. The Lorentzian shape causes a surge in the excitation rate over the other shape. The present investigation provides some useful perceptions of the functioning of mesoscopic devices where noise plays some profound role. Implications and influences: The present work assumes to have significance in engineering and technological applications of quantum dot nanodevices. Since in most of the devices noise plays some important role, the present study could also sincerely motivate further research on optical properties of those devices in presence of noise.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of noise shape on excitation kinetics of impurity doped quantum dots

Pal¹,

Sinha

Ganguly³

et al. 2014

Manufacturing Review

View full text Add to dashboard Cite

show abstract

“…Recent progress in nanoscale fabrication processes has made fabrication of quantum wires with various crosssections possible. Using improved growth methods for quantum wires such as gas-phase approaches and molecular-beam or metalorganic epitaxy [7,8], one can produce quantum wires with different cross-sectional shapes such as square, rectangle, triangle, circle, and hexagon [9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Energy gap renormalization and diamagnetic susceptibility in quantum wires with different cross-sectional shape

et al. 2016

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In this study, we investigate the effect of the cross-sectional shape on the energy gap renormalization and diamagnetic susceptibility in various quantum wires. To this end, we consider quantum wires with different cross-sectional shapes such as circular, square, hexagonal, and triangular. First, we employ the finite-element method and Arnoldi algorithm to solve the Schrödinger equation. Then, we calculate the energy levels, wavefunctions, binding energy, energy gap renormalization, and diamagnetic susceptibility. Our numerical results show that the binding energy decreases when the cross-sectional area is increased for all the quantum wires. Moreover, it is inferred that the cross-sectional shape is not important for large crosssectional area when calculating the binding energy. Indeed, the main parameter is the cross-sectional area rather than the length of a side. The energy gap renormalization decreases with increasing cross-sectional area, regardless of the impurity concentration. We observe that the highest and lowest energy gap renormalization correspond to triangular and circular quantum wires, respectively. The absolute value of the diamagnetic susceptibility increases with increasing crosssectional area for all the quantum wires investigated.

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“…Nowadays, with the advances in nanofabrication technologies like R. Khordad & H. Bahramiyan epitaxial techniques and metal-organic chemical vapor deposition, [6][7][8] it is possible for researchers to fabricate quantum wire structures of nanometer size with various cross-sections such as triangular, parallelogram, V-shape, T-shape, square, circular and hexagonal. [9][10][11][12] For example, Tsetseri et al 13 calculated the low-temperature electron mobility in V-shaped quantum well wires. Mohan et al 14 investigated the spectrum of luminescent hexagon superlattice, created by InP/InAs/InP nanotubes with the transversal cross-section of right hexagon shape.…”

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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Impurity-related linear and nonlinear optical response in quantum-well wires with triangular cross section

Cited by 78 publications

References 51 publications

Influence of noise shape on excitation kinetics of impurity doped quantum dots

Influence of noise shape on excitation kinetics of impurity doped quantum dots

Energy gap renormalization and diamagnetic susceptibility in quantum wires with different cross-sectional shape

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

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