Quantum dot molecules: A potential pathway towards terahertz devices

Kerr, William; Pancholi, Anup; Stoleru, V. G.

doi:10.1016/j.physe.2006.07.012

Cited by 23 publications

(6 citation statements)

References 19 publications

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“…Both QD and QR systems are a subject of great interest due to their prospective applications in the design and production of optoelectronic devices [9][10][11][12]. On the other hand, if the subject goes beyond the case of single nanostructures, the artificial molecules consisting of coupled QDs or QRs are particularly attractive because they show great promise for quantum information processing [13] and terahertz device production [14].…”

Section: Introductionmentioning

confidence: 99%

Quantum disc plus inverse square potential. An analytical model for two‐dimensional quantum rings: Study of nonlinear optical properties

Duque

2012

Annalen der Physik

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The exact solutions for the two-dimensional motion of a conduction band electron in a disc shaped quantum dot under the effect of an external magnetic field and parabolic and inverse square confining potentials are used to calculate the linear and nonlinear optical absorption as well as the linear and nonlinear corrections to the refractive index in the system. It is shown that this kind of structure may work well as a model for a quantum ring. Using the basic parameters typical of the GaAs, the results show that the influence of the normally oriented magnetic field induces a blueshift in both the first and third order peaks of the calculated optical quantities. In addition, total peak amplitudes are shown to be growing functions of the magnetic field strength. The increase in the strength of the inverse square potential function enhances significantly the contribution from the nonlinear third-order terms in both the absorption and the relative correction to the refractive index.

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Section: Introductionmentioning

confidence: 99%

Quantum disc plus inverse square potential. An analytical model for two‐dimensional quantum rings: Study of nonlinear optical properties

Duque

2012

Annalen der Physik

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“…Both kinds of systems are subjects of great interest among researchers due to their prospective applications in the design and production of optoelectronic devices . Going beyond the case of single nanostructures, the artificial molecules consisting of coupled QDs or QRs are particularly attractive for quantum information processing () and terahertz device production ().…”

Section: Introductionmentioning

confidence: 99%

Optical absorption and refractive index changes in a semiconductor quantum ring: Electric field and donor impurity effects

Acosta

Morales

Duque

2015

Phys. Status Solidi B

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The electron states in a two‐dimensional quantum dot ring are calculated in the presence of a donor impurity atom under the effective mass and parabolic band approximations. The effect of an externally applied electric field is also taken into account. The wavefunctions are obtained via the diagonalization of the problem Hamiltonian using a 2D expansion. The impurity‐related optical response is analyzed via the optical absorption and relative refractive index coefficients.

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“…QRs have recently received much attention due to unique physical properties, such as the Aharonov-Bohm effect, [1] the existence of a negative excitonic permanent dipole moment, [2] and their practical applications in quantum information processing [3] and terahertz devices. [4] As candidate substances for nanoscale semiconductor heterostructure fabrication, the II-VI materials have recently attracted increasing attention due to their large band gaps and their potential applications in short-wavelength optoelectronic devices. Among them, the CdTe/ZnTe material system is interesting for the fabrication of QDs and QRs, because the lattice mismatch between these two constituents is similar to that in the InAs/GaAs system, which is the most widely studied system in the context of QDs.…”

Section: Introductionmentioning

confidence: 99%

Size and temperature effects on electric properties of CdTe/ZnTe quantum rings

Hong¹,

Park²

2011

Chinese Phys. B

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The electronic properties of CdTe/ZnTe quantum rings (QRs) are investigated as functions of size and temperature using an eight-band strain-dependent k•p Hamiltonian. The size effects of diameter and height on the strain distributions around the QRs are studied. We find that the interband transition energy, defined as the energy difference between the ground electronic and the ground heavy-hole subbands, increases with the increasing QR inner diameter regardless of the temperature, while the interband energy decreases with the increasing QR height. This is attributed to the reduction of subband energies in both the conduction and the valence bands due to the strain effects. Our model, in the framework of the finite element method and the theory of elasticity of solids, shows a good agreement with the temperature-dependent photoluminescence measurement of the interband transition energies.

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Quantum dot molecules: A potential pathway towards terahertz devices

Cited by 23 publications

References 19 publications

Quantum disc plus inverse square potential. An analytical model for two‐dimensional quantum rings: Study of nonlinear optical properties

Quantum disc plus inverse square potential. An analytical model for two‐dimensional quantum rings: Study of nonlinear optical properties

Optical absorption and refractive index changes in a semiconductor quantum ring: Electric field and donor impurity effects

Size and temperature effects on electric properties of CdTe/ZnTe quantum rings

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