Nonlinear Quantum Beats of Excitons in CdSe

Pantke, K.-H.; Schillak, P.; Erland, J.; Lyssenko, V. G.; Razbirin, B. S.; Hvam, Jørn Märcher

doi:10.1002/pssb.2221730110

Cited by 9 publications

(3 citation statements)

References 15 publications

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“…Theoretical studies about quantum beats of excitons have covered many methods such as the renormalized wavefunction theory, 36) the density matrix theory, 44) the third-order nonlinear susceptibility method, 45) the photoemission theory, 46) or the non-equilibrium many-body perturbation theory. 47) In the first-mentioned article, the authors have determined the excitonic state under the effect of a highintensity laser pulse and have found the oscillatory form of the time-resolved intensity of absorption of a probe pulse.…”

Section: Introductionmentioning

confidence: 99%

A study on quantum beats of excitons in GaAs/AlGaAs circular cylindrical quantum wires

Phuoc

Bao

Hien

et al. 2020

Jpn. J. Appl. Phys.

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This paper presents a theoretical investigation of quantum beats of excitons in GaAs/AlGaAs circular cylindrical quantum wires. A three-level model of excitons, including a ground state and two excited states, has been applied to derive the renormalized wavefunctions and the time-dependent absorption intensity of excitons when the system is irradiated by a strong pump laser resonating with the distance between the two excited-levels. Our results show that a periodic oscillation form of the absorption intensity, obvious evidence of the quantum beat behavior, has appeared. Furthermore, the mechanism of the generation, as well as the effects of the wire radius and the pump laser detuning on the frequency (period) and amplitude of quantum beats, have been explained in detail. These results suggest potential applications in the fabrication of some quantum computation devices.

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Section: Introductionmentioning

confidence: 99%

A study on quantum beats of excitons in GaAs/AlGaAs circular cylindrical quantum wires

Phuoc

Bao

Hien

et al. 2020

Jpn. J. Appl. Phys.

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“…4. Exciton density dependence of the dephasing rates of free ( 0 ) and bound (0) excitons in CdSe at 4.2 K. The lines are fits from (2), see text nances, we have also observed quantum interference effects between a coherently prepared continuous distribution of propagating polariton modes [17]. These effects are reported separately in the present volume [18].…”

Section: Coherent Exciton Dynamicsmentioning

confidence: 61%

Coherent and Incoherent Exciton Dynamics in II–VI Semiconductors

Pantke

Lyssenko

Razbirin

et al. 1992

Physica Status Solidi (b)

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and bound excitons in CdSe and localized excitons in CdSe,S1-, are studied by degenerate four-wave mixing and light-induced grating experiments. In the coherent range, the dephasing of excitons is determined as a function of temperature, density and energy. For incoherent excitons, recombination lifetimes and diffusion coefficients are determined. In particular, the mobility of excitons in CdSe,S, -x near the mobility edge is studied.

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“…Using ultrashort laser pulses with various experiments [24][25][26][27][28][29][30], scientists have observed quantum beats of excitons in different semiconductor structures. Theoretically, scientists have applied many methods to study the quantum beats of excitons in quantum structures [25,[31][32][33][34][35][36], of which the most convenient is the renormalized wavefunction method [32,35,36].…”

Section: Introductionmentioning

confidence: 99%

Quantum Beat of Excitons in the Prolate Ellipsoidal Quantum Dots

Bao

Phuoc

Hien

et al. 2022

Journal of Nanomaterials

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In this paper, renormalized wavefunction method was applied to study quantum beats of excitons in the InGaAs/InAlAs prolate ellipsoidal quantum dots (QDs). The obtained results show that, without the pump laser, the exciton absorption intensity is just a smooth curve. In contrast, when the system is illuminated by a strong pump laser resonating with two exciton levels, the oscillation behavior of exciton absorption intensity, which is known as quantum beats of excitons, is observed. That result can be interpreted as an indirect consequence of the Pauli exclusion principle leading to a splitting of the electron levels, which forms two close exciton levels, and if two excitons are excited coherently, the interference of these two excitons will finally form a quantum beat. The study also shows that the geometry shape of the QDs has strong influence on the properties of quantum beats. Changing the period of quantum beats in particular or optical properties in general in QDs thus becomes more flexible through changing their geometry shapes. This is one interested advantage of the ellipsoidal QDs and is expected to increase their applicability more than the spherical QDs.

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Nonlinear Quantum Beats of Excitons in CdSe

Cited by 9 publications

References 15 publications

A study on quantum beats of excitons in GaAs/AlGaAs circular cylindrical quantum wires

A study on quantum beats of excitons in GaAs/AlGaAs circular cylindrical quantum wires

Coherent and Incoherent Exciton Dynamics in II–VI Semiconductors

Quantum Beat of Excitons in the Prolate Ellipsoidal Quantum Dots

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