Exciton spectroscopy of optical reflection from wide quantum wells

Khramtsov, E. S.; Grigoryev, P. S.; Loginov, D. K.; Ignatiev, I. V.; Efimov, Yu. P.; Eliseev, S. A.; Ivchenko, E. L.; Bayer, М.

doi:10.1103/physrevb.99.035431

Cited by 26 publications

(28 citation statements)

References 35 publications

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“…We attribute the oscillations to the quantum-confined exciton states in the QW. Similar oscillations were measured in reflectance spectra of heterostructures with wide QWs by many authors [18,41,42,[44][45][46]. However, such oscillations are typically observed in a relatively narrow spectral range, of order of several tens of meV.…”

Section: Methodssupporting

confidence: 82%

“…The wavevector selection rules for optical transitions are broken by the QW interfaces. The model of quantization of the exciton motion across the QW layer is well verified for the wide QWs [31,[40][41][42][43]. In contemporary optical experiments with wide QWs in high-quality heterostructures, one can observe many quantum-confined exciton states.…”

Section: Introductionmentioning

confidence: 61%

“…In contemporary optical experiments with wide QWs in high-quality heterostructures, one can observe many quantum-confined exciton states. The states are typically observed as resonant features (oscillations) in the reflectance spectra of the heterostructures [40][41][42][43][44][45][46][47][48][49][50][51]. This allows one to study the effects of the external fields on the propagating excitons.…”

Section: Introductionmentioning

confidence: 99%

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Exciton-polariton interference controlled by electric field

Loginov

Belov

Davydov

et al. 2020

Phys. Rev. Research

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Linear-in-wave-vector K terms of an electron Hamiltonian play an important role in topological insulators and spintronic devices. Here we demonstrate how an external electric field can control the magnitude of a linear-inK term in the exciton Hamiltonian. The effect of the electric field on interference of exciton polaritons in a high-quality structure with a wide GaAs quantum well was experimentally studied by means of the differential reflection spectroscopy. It is found that the interference pattern is strongly suppressed at certain electric field and then it is reinstalled, but with an inverted phase, at the further increase of the field. This behavior of the pattern is successfully explained by the electric-field-induced linear-inK terms in the Hamiltonian of the exciton propagating across the quantum well. An excellent agreement between the experimental data and the results of calculations using semiclassical nonlocal dielectric response model confirms the validity of the method and paves the way for the realization of excitonic Datta-Das transistors. In full analogy with the spin-orbit transistor proposed by Datta and Das [Appl. Phys. Lett. 56, 665 (1990)], the switch between positive and negative interference of exciton polaritons propagating forward and backward in a GaAs film is achieved by application of an electric field having a nonzero component in the plane of the quantum well layer.

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Section: Methodssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

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Exciton-polariton interference controlled by electric field

Loginov

Belov

Davydov

et al. 2020

Phys. Rev. Research

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“…This effect is well known in the physics of Wannier-Mott excitons, bound electronhole pairs, confined in semiconductor nanostructures. It can be phenomenologically described as a formation of a so-called "dead layer" with the thickness on the order of the exciton Bohr radius [19][20][21]. As a result, the effective barrier for excitons should be placed not exactly at the edge but at a certain distance.…”

Section: Bound Pair Near the Edgementioning

confidence: 99%

Quasiflat band enabling subradiant two-photon bound states

Poddubny

2020

Phys. Rev. A

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We study theoretically the radiative lifetime of bound two-particle excitations in a waveguide with an array of two-level atoms, realising a 1D Dicke-like model. Recently, Zhang et al. [1] have numerically found an unexpected sharp maximum of the bound pair lifetime when the array period d is equal to 1/12th of the light wavelength λ0 [arXiv:1908.01818]. We uncover a rigorous transformation from the non-Hermitian Hamiltonian with the long-ranged radiative coupling to the nearest-neigbor coupling model with the radiative losses only at the edges. This naturally explains the puzzle of long lifetime: the effective mass of the bound photon pair also diverges for d = λ0/12, hampering an escape of photons through the edges. We also link the oscillations of the lifetime with the number of atoms to the nonmonotous quasi-flat-band dispersion of the bound pair.

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“…1. Наблюдаемые экситонные резонансы хорошо описываются в рамках стандартной модели отражения [3][4][5][6]. Это позволяет с высокой точностью определять спектральное положение и уширение экситонных резонансов.…”

Section: Introductionunclassified

Подавление Электронно-Дырочного Обменного Взаимодействия В Резервуаре Неизлучающих Экситонов

Трифонов¹,

Игнатьев²,

Кавокин³

et al. 2019

Физика И Техника Полупроводников

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Mechanisms of the suppression of the electron-hole exchange interaction in nonradiative excitons with a large in-plane wave vector in high-quality heterostructures with quantum wells are analyzed theoretically. It is shown that the dominant suppression mechanism is exciton-exciton scattering accompanied by the mutual spin flips of like carriers (either two electrons or two holes), comprising the excitons. As a result, the electron spin polarization in nonradiative excitons may be retained for a long time. The analysis of experimental data shows that this relaxation time can exceed one nanosecond. This long-term and optically controllable spin memory in an exciton reservoir may be of interest for future information technologies.

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Exciton spectroscopy of optical reflection from wide quantum wells

Cited by 26 publications

References 35 publications

Exciton-polariton interference controlled by electric field

Exciton-polariton interference controlled by electric field

Quasiflat band enabling subradiant two-photon bound states

Подавление Электронно-Дырочного Обменного Взаимодействия В Резервуаре Неизлучающих Экситонов

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