Optical properties of an off-center hydrogenic impurity in a spherical quantum dot with Gaussian potential

Xie, Wenfang

doi:10.1016/j.spmi.2010.04.015

Cited by 76 publications

(27 citation statements)

References 33 publications

(39 reference statements)

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“…The Schrödinger equation with Hamiltonian (2.4) can be solved taking polarization charges into consideration. The wave function which is a solution to the Schrödinger equation with Hamiltonian (2.4) is expressed by the expansion over the function (2.7): 12) i is the quantum number set n, l, m. Our task reduces to the linear system of equations…”

Section: -2mentioning

confidence: 99%

Analysis of the effect of polarization traps and shallow impurities on the interlevel light absorption of quantum dots

Boichuk¹,

Leshko²,

Karpyn³

2017

Condens. Matter Phys.

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A spherical quantum dot (QD) heterosystem CdS/SiO 2 has been studied. Each QD has a hydrogen-like impurity in its center. Besides that, it has been accounted that a polarization trap for electron exists at the interfaces due to the difference between the QD and matrix dielectric permittivity. It has been defined that for small QD radii there are surface electron states. For different radii, partial contributions of the surface states into the electron energy caused by the electron-ion and electron-polarization charges interaction have been defined. The linear light absorption coefficient of noninteracting QDs has been calculated taking into account the QD dispersion by the size. It is shown that the surface states can be observed into different ranges of an electromagnetic spectrum.

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Section: -2mentioning

confidence: 99%

Analysis of the effect of polarization traps and shallow impurities on the interlevel light absorption of quantum dots

Boichuk¹,

Leshko²,

Karpyn³

2017

Condens. Matter Phys.

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“…Hence, the investigation of electronic and optical properties of hydrogenic impurities is essential to optimize the performance of the photoelectric devices. Many authors investigated the properties of hydrogenic impurities in SQDs [11][12][13][14][15][16][17][18][19]. In addition, external perturbation such as application of an electric and magnetic field can provide valuable information [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…It was shown that the impurity has remarkable effects on the nonlinear optical properties such as absorption and refractive index changes. Xie studied the optical absorption coefficients and refractive index changes associated with intersubband transition of an off-center hydrogenic impurity in a spherical quantum dot (QD) with Gaussian confinement potential [29]. Cakir et al and Karabulut et al investigated the impurity effect on linear and nonlinear optical properties of a spherical SQD [15,30].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear optical rectification of hydrogenic impurity in a disk-like parabolic quantum dot: The role of applied magnetic field

Shojaei

Vala

2015

Physica E: Low-dimensional Systems and Nanostructures

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“…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%

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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Optical properties of an off-center hydrogenic impurity in a spherical quantum dot with Gaussian potential

Cited by 76 publications

References 33 publications

Analysis of the effect of polarization traps and shallow impurities on the interlevel light absorption of quantum dots

Analysis of the effect of polarization traps and shallow impurities on the interlevel light absorption of quantum dots

Nonlinear optical rectification of hydrogenic impurity in a disk-like parabolic quantum dot: The role of applied magnetic field

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

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