Many-body effects in wide parabolic AlGaAs quantum wells

Tabata, A.; Martins, Moisés Rodrigues; Oliveira, José Brás Barreto de; Lamas, T. E.; Duarte, Cesário Antônio; Silva, E. C. F. da; Gusev, G. M.

doi:10.1063/1.2809418

Cited by 8 publications

(5 citation statements)

References 23 publications

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“…The additional perturbation will cause the coherent transitions between transverse modes of the beam similar to the transitions between atomic states caused by the external perturbation, for example, laser field action. Really, substituting general decomposition (5) to equation ( 1) and taking into account that R n (x) is the solution of the eigenvalue problem ( 6) one obtains the following set of equations for the population of the resonator modes (13) which is similar to that obtained in quantum mechanical the ory of lightatom interaction. Here…”

Section: Model and Discussionmentioning

confidence: 95%

“…Such situation can be realized in the heterostructures formed by a number of di electric layers with different values of susceptibility (or permittivity) and a beam of light propagation along the structure. Such structures with rather different 'potential' pro files (including quasiparabolic form) can be prepared by the molecular beam epitaxy method [13].…”

Section: Model and Discussionmentioning

confidence: 99%

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‘Quantum effects’ for classical light in modern waveguide circuits

et al. 2019

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Here we use approaches and concepts from quantum mechanics in order to analyze the propagation of classical electromagnetic waves in the elements of integrated optical circuits. These waveguide circuits are considered as potential wells between complexshapes barriers formed by opaque media. This allowed us to construct in the framework of the slowvarying amplitude approximation for the wave equation an analogy between coherent oscillations in a quantum system and the redistribution in space of the field strength of a classical wave. We also demonstrated the methods to control the mode composition of a classical light in a spatially inhomogeneous waveguide structure. The proposed description was based on the analogy with Rabitype oscillations in quantum mechanics.

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Section: Model and Discussionmentioning

confidence: 95%

Section: Model and Discussionmentioning

confidence: 99%

‘Quantum effects’ for classical light in modern waveguide circuits

et al. 2019

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“…These initial values will be refined by comparing the obtained excitonic spectra with the experimental data of Miller et al [1]. These constants will be then used to determine the elements (13). In order to compute the optical spectra we have to solve the system (11) of coupled differential equations.…”

Section: The Parameters Of the Effective Potentialmentioning

confidence: 99%

“…The structures with parabolic confinement have attracted more attention in the recent decades (for example, Refs. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]). In typical (narrow) quantum wells (QW) with the dimension of, say, one excitonic Bohr radius in the growth direction we observe only a few excited states.…”

Section: Introductionmentioning

confidence: 99%

Excitonic spectra of wide parabolic quantum wells

2015

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Abstract. The optical properties of wide quantum wells are considered, taking into account the screened electron-hole interaction potential and parabolic confinement potentials, different for the electrons and for the holes. The role of the interaction potential which mixes the energy states according to different quantum numbers is stressed. The results obtained by our method are in agreement with the observed spectra and give the possibility to the assessment of the resonances.

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“…In most of these nanostructures the applied electric field causes a red-shift of the positions of the lowest energy states, changes in the exciton binding energy, and lowering the oscillator strengths of the resonances. Here we consider QCSE in wide parabolic quantum wells (WPQWs), of thicknesses in the growth direction of the order of a few excitonic Bohr radii of the well material (see, for example [39][40][41]43], and references therein). The optical spectra of WPQWs show a large number of resonances, which are due to the transitions between confined states.…”

Section: Introductionmentioning

confidence: 99%

Quantum confined stark effect in wide parabolic quantum wells: real density matrix approach

2015

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Abstract.We show how to compute the optical functions of wide parabolic quantum wells (WPQWs) exposed to uniform electric F applied in the growth direction, in the excitonic energy region. The effect of the coherence between the electron-hole pair and the electromagnetic field of the propagating wave including the electron-hole screened Coulomb potential is adopted, and the valence band structure is taken into account in the cylindrical approximation. The role of the interaction potential and of the applied electric field, which mix the energy states according to different quantum numbers and create symmetry forbidden transitions, is stressed. We use the real density matrix approach (RDMA) and an effective e-h potential, which enable to derive analytical expressions for the WPQWs electrooptical functions. Choosing the susceptibility, we performed numerical calculations appropriate to a GaAs/GaAlAs WPQWs. We have obtained a red shift of the absorption maxima (quantum confined Stark effect), asymmetric upon the change of the direction of the applied field (F → −F), parabolic for the ground state and strongly dependent on the confinement parameters (the QWs sizes), changes in the oscillator strengths, and new peaks related to the states with different parity for electron and hole.

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Many-body effects in wide parabolic AlGaAs quantum wells

Cited by 8 publications

References 23 publications

‘Quantum effects’ for classical light in modern waveguide circuits

‘Quantum effects’ for classical light in modern waveguide circuits

Excitonic spectra of wide parabolic quantum wells

Quantum confined stark effect in wide parabolic quantum wells: real density matrix approach

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