Hydrostatic Pressure and Magnetic Field Effects on the Exciton States in Vertically Coupled GaAs-(Ga,Al)As Quantum Dots

Aguilar, Rodríguez; López, Sonia; Duque, C.A.

doi:10.2529/piers071004154732

Cited by 11 publications

(1 citation statement)

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“…Changing the shape and size of these dots provides great advantages in view of tuning desired properties. Theoretical studies on vertically coupled QDs have been put forward in recent times [1][2][3][4][5][6][7]. In Refs.…”

Section: Introductionmentioning

confidence: 99%

Linear and nonlinear optical absorption coefficients in GaAs/Ga1−xAlxAs concentric double quantum rings: Effects of hydrostatic pressure and aluminum concentration

Baghramyan

Barseghyan

Kirakosyan

et al. 2013

Journal of Luminescence

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The linear and nonlinear intra-band optical absorption coefficients in GaAs/Ga 1 À x Al x As two-dimensional concentric double quantum rings are investigated. Taking into account the combined effects of hydrostatic pressure and aluminum concentration the energies of the ground ðn ¼ 1, l ¼ 0Þ and the first excited state ðn ¼ 2, l ¼ 1Þ have been found using the effective mass approximation and the transfer matrix formalism. The energies of these states and the corresponding threshold energy of the intraband optical transitions are examined as a function of hydrostatic pressure and aluminum concentration for different sizes of the structure. We also investigated the dependencies of the linear, nonlinear, and total optical absorption coefficients as functions of the incident photon energy for different values of hydrostatic pressure, aluminum concentration, sizes of the structure, and incident optical intensity. Its is found that the effects of the hydrostatic pressure and the aluminum concentration lead to a shifting of the resonant peaks of the intra-band optical spectrum.

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