Energy states and magnetization in nanoscale quantum rings

Voskoboynikov, O.; Li, Yiming; Lu, Hsiao Mei; Shih, Cheng Feng; Lee, C. P.

doi:10.1103/physrevb.66.155306

Cited by 70 publications

(59 citation statements)

References 29 publications

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“…Recent experiments [4] have shown that the rings, as will be studied here, have the "eye" type cross-section as presented in upper insert in the panel (a) of Fig. 1.…”

Section: Theory and Resultsmentioning

confidence: 97%

“…1 (a). Previously we have treated theoretically torus (cut-torus) shaped nano-scale rings in external magnetic fields, using an effective Hamiltonian with position dependent electronic and hole effective masses [4,14]. It was found that experimentally relevant simulations of the behavior of nano-rings can only be obtained with three-dimensional models using the experimentally determined shape, strain and composition of the rings [9].…”

Section: Theory and Resultsmentioning

confidence: 99%

“…Here we calculate electron and hole energies/envelope wave functions, adjacent to the energy gap, for these "eye" shaped dots and rings as a function of a magnetic field in the z-direction. Details of the method of calculation can be found in [4,14]. For frequencies ω close to the energy gap of the nano-objects, the size of the object is small as compared to the wavelength and the dipole approximation can be used.…”

Section: Theory and Resultsmentioning

confidence: 99%

“…They are expected to play an important role in several urgent areas of modern technology, like optics, optoelectronics, optical computing and quantum cryptography and computing. Semiconductor nanorings [1] are about the newest not-simply connected quantum nano-objects with unusual magnetic and magnetic-optical properties [2][3][4]. Like self-assembled semiconductor quantum dots, nano-rings are free of decoherence problems caused by scattering.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Magneto-optics of layers of semiconductor quantum dots and nano-rings

Voskoboynikov¹,

Wijers²,

Liu³

et al. 2006

Braz. J. Phys.

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We have studied the collective magneto-optical response of layers of semiconductor quantum dots and nanorings. Expressions for both the polarizability of the individual nano-objects have been used to determine the magneto-optical response on square two-dimensional lattices on those nano-objects as a function on frequency, magnetic field and angle of incidence. The magnetic field dependence of the response for layers of rings gives rise to the Aharonov-Bohm type oscillatory behavior in the reflectance and absorbance that can be measurable. Layers of dots do not display any remarkable magnetic field dependence.

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“…Recent experiments [4] have shown that the rings, as will be studied here, have the "eye" type cross-section as presented in upper insert in the panel (a) of Fig. 1.…”

Section: Theory and Resultsmentioning

confidence: 97%

Section: Theory and Resultsmentioning

confidence: 99%

Section: Theory and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Magneto-optics of layers of semiconductor quantum dots and nano-rings

Voskoboynikov¹,

Wijers²,

Liu³

et al. 2006

Braz. J. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Intersubband spin-density excitations in QWs have been addressed using the Kohn-Sham equations with energy-dependent effective mass. 8 Extensive single particle studies of different shaped QDs, [9][10][11] quantum rings, 12 and artificial molecules 13 have also been carried out. Recently, the energy-dependent effective mass approach has reproduced experimental effective masses obtained from optical transition energies in QWs 14 and provided quantitative interpretations of capacitance voltage spectroscopy experiments.…”

Section: Introductionmentioning

confidence: 99%

Nonparabolicity and dielectric effects on addition energy spectra of spherical nanocrystals

Planelles¹,

Royo²,

Pí

2007

Journal of Applied Physics

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An extension of the spin density functional theory simultaneously accounting for dielectric mismatch between neighboring materials and nonparabolicity corrections originating from interactions between conduction and valence bands is presented. This method is employed to calculate ground state and addition energy spectra of homogeneous and multishell spherical quantum dots. Our calculations reveal that corrections become especially relevant when they come into play simultaneously in strong regimes of spatial confinement.

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“Negative” diamagnetism of three‐dimensional arrays of semiconductor nano‐rings

Thu

Chiu

Voskoboynikov³

2013

Physica Status Solidi (b)

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We theoretically study the orbital diamagnetic response of three‐dimensional arrays of embedded InAs/GaAs wobbled nano‐rings. To simulate the rings' magnetic characteristics, we use the effective one band Hamiltonian (energy and position‐dependent electron effective mass and Landé factor) and smooth three‐dimensional confinement potential that is mapping the actual strain and material content inside the rings. First, we obtain the magnetic susceptibility of an individual nano‐ring. Once it is achieved, using the Claussius–Mossotti relation we estimate the effective susceptibility of three‐dimensional arrays of the rings. We show that conventionally diamagnetic InAs/GaAs ring structures under certain conditions can demonstrate the positive peak of the effective magnetic susceptibility of the arrays, that we call “negative”‐diamagnetic response. The “negative”‐diamagnetic (positive susceptibility) peak remains Lorentz‐like shaped and gradually disappears when the rings' concentration in the arrays decreases.

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Energy states and magnetization in nanoscale quantum rings

Cited by 70 publications

References 29 publications

Magneto-optics of layers of semiconductor quantum dots and nano-rings

Magneto-optics of layers of semiconductor quantum dots and nano-rings

Nonparabolicity and dielectric effects on addition energy spectra of spherical nanocrystals

“Negative” diamagnetism of three‐dimensional arrays of semiconductor nano‐rings

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