Towards Wannier-Stark THz superlattice laser

Andronov, A. A.; Dodin, E. P.; Zinchenko, D. I.; Nozdrin, Yu. N.

doi:10.1088/1742-6596/193/1/012079

Cited by 7 publications

(10 citation statements)

References 8 publications

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“…[3][4][5] However, this type of gain is intrinsically connected with the negative differential conductivity in the current-field relation, so that the formation of field domains 6-9 strongly limits its observation and practical use. As an alternative, it was suggested 10 that gain can be present in the positive differential conductivity region of SLs where resonant tunneling over several barriers [11][12][13] is relevant. The idea is to operate the SL slightly below the tunneling resonance from the ground state of well µ to the excited state in the next-neighboring well µ + 2 (see the inset of FIG.…”

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confidence: 99%

Superlattice gain in positive differential conductivity region

2016

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We analyze theoretically a superlattice structure proposed by A. Andronov et al. [JETP Lett 102, 207 (2015)] to give Terahertz gain for an operation point with positive differential conductivity. Here we confirm the existence of gain and show that an optimized structure displays gain above 20 cm −1 at low temperatures, so that lasing may be observable. Comparing a variety of simulations, this gain is found to be strongly affected by elastic scattering. It is shown that the dephasing modifies the nature of the relevant states, so that the common analysis based on Wannier-Stark states is not reliable for a quantitative description of the gain in structures with extremely diagonal transitions.

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confidence: 99%

Superlattice gain in positive differential conductivity region

2016

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“…Сплайни iз змiнним ступенем були запропонованi [13], якi виправляли проблему "нефiзичних" хвиль на апроксимацiях полiномами. Огляди iснуючих методiв приведенi [15][16][17][18].…”

Section: вступunclassified

“…Проведено дослiдження статистичних властивостей параметрiв моделi та апроксимацiй методом статистичного самотворення (bootstrap) для тестових та реальних даних. Для додаткової функцiї ваги, порiвняння розподiлу оцiнок коефiцiентiв iз нормальним розподiлом проведено [54].…”

Section: висновкиunclassified

MAVKA: Program of statistically optimal determination of phenomenological parameters of extrema. Parabolic spline algorithm and analysis of variability of the semi-regular star Z UMa

Andrych¹,

Андронов²,

Chinarova³

2020

J. Phys. Stud.

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the difference between the 0.975 and 0.025 percentiles (divided by 2*1.96) as the accuracy estimate of a given parameter in the bootstrap method. The variability of the semi-regular pulsating star Z UMa is analyzed. The presence of multicomponent variability of an object, including, four periodic oscillations (188.88(3), 197.89(4) days and halves of both) and significant variability of the amplitudes and phases of individual oscillations are shown. Approximation using the parabolic spline is only slightly better than the asymptotic parabola, for our sampling of the complete interval. It is expectedly better for larger subintervals. The use of different complementary methods allows to get a statistically optimal phenomenological approximation.

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“…We also presented an atlas of the mean light curves of 34 faint Mira-type stars [25], based on digitized data from the scanned Atlas by Maei & Tosti 1 .…”

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confidence: 99%

“Inter-Longitude Astronomy” project: long period variable stars

Андронов¹,

Marsakova²,

Kudashkina³

et al. 2014

Adv.Astron.Spa.Physics

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This article contains the highlights of complex studies of long-period variable stars such as Miras: semiregular, symbiotic (particularly, pulsating symbiotic), as well as RV Tauri-type stars. In the course of these studies, important characteristics of mean light curves were determined. In the case of multi-component variability, additional periods were found. Correlations between parameters of mean light curves were investigated. The cycle-to-cycle changes of light curve parameters were analysed using various mathematical methods. Classication criteria of variable stars and eects of variability were proposed based on this research. The study of observational parameters and the correlations between them can be used to estimate the age, mass, and other physical characteristics of AGB stars.

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Towards Wannier-Stark THz superlattice laser

Cited by 7 publications

References 8 publications

Superlattice gain in positive differential conductivity region

Superlattice gain in positive differential conductivity region

MAVKA: Program of statistically optimal determination of phenomenological parameters of extrema. Parabolic spline algorithm and analysis of variability of the semi-regular star Z UMa

“Inter-Longitude Astronomy” project: long period variable stars

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