Optical exciton Stark effect and quantum beats at exciton quasienergy levels in quantum wells

Bobrysheva, A. I.; Shmiglyuk, M. I.; Pavlov, V. G.

doi:10.1134/1.1130033

Cited by 5 publications

(6 citation statements)

References 15 publications

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“…34) The studies and application of quantum beats of excitons that originated from a quantum interference of two exciton transitions from ground level to two close-lying excited levels of exciton have received much attention from scientists in the field. [35][36][37] The quantum beats of excitons in lowdimensional semiconductor structures were first investigated in semiconductor quantum wells. [38][39][40][41] Then, experimental measurements of this phenomenon are expanded to semiconductor quantum dot structures.…”

Section: Introductionmentioning

confidence: 99%

“…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%

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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%

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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“…In 1986 [ 30 ], the split, or more particularly the exciton optical Stark effect, was identified for the first time in quantum wells. Due to its potential use in ultrafast nonlinear optical devices, such as optical gating [ 32 , 33 ] and high-speed all-optical switching [ 30 , 34 ], as well as its contribution to the understanding of the interaction between photons and semiconductors [ 35 ], this separation has received considerable theoretical and experimental attention [ 30 , 31 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 ]. There are two types of separation: two-level [ 60 ] and three-level [ 60 , 61 ].…”

Section: Introductionmentioning

confidence: 99%

A Theoretical Study of Interband Absorption Spectra of Spherical Sector Quantum Dots under the Effect of a Powerful Resonant Laser

et al. 2023

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We explore the variation of interband absorption spectra of GaAs spherical sector quantum dots (QDs) in response to a strong resonant laser, using the renormalized wave function method. Even though a spherical sector QD appears identical to a section cut from a spherical QD, it contains a controllable additional spatial parameter, the apical angle, which results in radically different wave functions and energy levels of particles, and is anticipated to exhibit novel optical properties. The obtained findings reveal that the apical angle of the dot has a considerable effect on the interband absorption spectrum. With the increase in the dot apical angle, a significant redshift of the interband absorption peaks has been identified. Increasing the pump laser detuning and dot radius yields similar results. Especially when a powerful resonant laser with tiny detuning is utilized, a dynamical coupling between electron levels arises, resulting in the formation of new interband absorption peaks. These new peaks and the former ones were similarly influenced by the aforementioned parameters. Furthermore, it is thought that the new peaks, when stimulated by a suitable laser, will produce the entangled states necessary for quantum information.

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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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Optical exciton Stark effect and quantum beats at exciton quasienergy levels in quantum wells

Cited by 5 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

A Theoretical Study of Interband Absorption Spectra of Spherical Sector Quantum Dots under the Effect of a Powerful Resonant Laser

Quantum Beat of Excitons in the Prolate Ellipsoidal Quantum Dots

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