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Воронова, Нина Сергеевна

Организационные подразделения

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Институт лазерных и плазменных технологий

Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.

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Воронова

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Нина Сергеевна

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Теперь показываю 1 - 10 из 13

Только метаданные
Photonic engineering providing conditions for direct exciton macroscopic coherence at elevated temperatures
(2019) Kurbakov, I. L.; Lozovik, Y. E.; Voronova, N. S.; Воронова, Нина Сергеевна
© 2019 SPIE. The possibility to observe a macroscopically coherent state in a gas of two-dimensional direct excitons at temperatures up to tens of Kelvin is described. The dramatic increase of the exciton lifetime allowing effective thermalization is predicted for the o-resonant cavities that strongly suppress exciton recombination. The material systems considered are single GaAs quantum wells of different thicknesses and a transition metal dichalcogenide monolayer, embedded in a layered medium with subwavelength period. The quantum hydrodynamic approach combined with the Bogoliubov description yield the one-body density matrix of the system. Employing the Kosterlitz-Thouless "dielectric screening" problem to account for vortices, we obtain the superfluid and the condensate densities and the critical temperature of the Berezinskii-Kosterlitz-Thouless crossover, for all geometries in consideration. Experimentally observable many fold increase of the photoluminescence intensity from the structure as it is cooled below the critical temperature is predicted.
Только метаданные
Anisotropic Superfluidity in a Weakly Interacting Condensate of Quasi-2D Photons
(2019) Lozovik, Y. E.; Voronova, N. S.; Воронова, Нина Сергеевна
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim The anisotropic superfluidity in a weakly interacting two-dimensional Bose gas of photons in a dye-filled optical microcavity is investigated, taking into account the dependence of the photon effective mass on the in-plane coordinate. With the use of the generalized Gross–Pitaevskii equation and the Bogoliubov approach, it is shown that the modulation of the microcavity width leads to an effective periodic potential and the periodicity of the condensate wave function, and both the condensate energy and the spectrum of elementary excitations depend on the direction of motion. The anisotropic character of the dynamical and superfluid properties, such as helicity modulus, superfluid density, and sound velocity, as well as experimentally observable manifestations of their anisotropy are described.
Только метаданные
Full-Bloch beams and ultrafast Rabi-rotating vortices
(2021) Dominici, L.; Colas, D.; Gianfrate, A.; Rahmani, A.; Voronova, N.; Воронова, Нина Сергеевна
Strongly coupled quantum fields, such as multicomponent atomic condensates, optical fields, and polaritons, are remarkable systems where the simple dynamics of coupled oscillators can meet the intricate phenomenology of quantum fluids. When the coupling between the components is coherent, not only the particles' number, but also their phase texture that maps the linear and angular momentum, can be exchanged. Here, on a system of exciton polaritons, we have realized a so-called full-Bloch beam: a configuration in which all superpositions of the upper and the lower polaritons-all quantum states of the associated Hilbert space-are simultaneously present at different points of the physical space, evolving in time according to Rabi-oscillatory dynamics. As a result, the light emitted by the cavity displays a peculiar dynamics of spiraling vortices endowed with oscillating linear and angular momenta and exhibiting ultrafast motion of their cores with striking accelerations to arbitrary speeds. This remarkable vortex motion is shown to result from distortions of the trajectories by a homeomorphic mapping between the Rabi rotation of the full wave function on the Bloch sphere and Apollonian circles in the real space where the observation is made. Such full-Bloch beams offer prospects at a fundamental level regarding their topological properties or in the interpretation of quantum mechanics, and the Rabi-rotating vortices they yield should lead to interesting applications such as ultrafast optical tweezers.
Только метаданные
Shaping the topology of light with a moving Rabi-oscillating vortex
(2021) Dominici, L.; Colas, D.; Gianfrate, A.; Rahmani, A.; Voronova, N.; Воронова, Нина Сергеевна
© 2021 Optical Society of America under the terms of the OSA Open Access Publishing AgreementQuantum vortices are the analogue of classical vortices in optics, Bose-Einstein condensates, superfluids and superconductors, where they provide the elementary mode of rotation and orbital angular momentum. While they mediate important pair interactions and phase transitions in nonlinear fluids, their linear dynamics is useful for the shaping of complex light, as well as for topological entities in multi-component systems, such as full Bloch beams. Here, setting a quantum vortex into directional motion in an open-dissipative fluid of microcavity polaritons, we observe the self-splitting of the packet, leading to the trembling movement of its center of mass, whereas the vortex core undergoes ultrafast spiraling along diverging and converging circles, in a sub-picosecond precessing fashion. This singular dynamics is accompanied by vortex-antivortex pair creation and annihilation and a periodically changing topological charge. The spiraling and branching mechanics represent a direct manifestation of the underlying Bloch pseudospin space, whose mapping is shown to be rotating and splitting itself. Its reshaping is due to three simultaneous drives along the distinct directions of momentum and complex frequency, by means of the differential group velocities, Rabi frequency and dissipation rates, which are natural assets in coupled fields such as polaritons. This state, displaying linear momentum dressed with oscillating angular momentum, confirms the richness of multi-component and open quantum fluids and their innate potentiality to implement sophisticated and dynamical topological textures of light.
Только метаданные
Finite-temperature Hartree-Fock-Bogoliubov theory for exciton-polaritons
(2021) Grudinina, A. M.; Kurbakov, I. L.; Lozovik, Y. E.; Voronova, N. S.; Грудинина, Анна Михайловна; Воронова, Нина Сергеевна
Microcavity exciton-polaritons, known to exhibit nonequilibrium Bose condensation at high critical temperatures, can also be brought in thermal equilibrium with the surrounding medium and form a quantum degenerate Bose-Einstein distribution. It happens when their thermalization time in the regime of positive detunings-or, alternatively, for high-finesse microcavities-becomes shorter than their lifetime. Here we present the self-consistent finite-temperature Hartree-Fock-Bogoliubov description for such a system of polaritons, universally addressing the excitation spectrum, momentum-dependent interactions, condensate depletion, and the background population of dark excitons that contribute to the system's chemical potential. Employing the derived expressions, we discuss the implications for the Bogoliubov sound velocity, confirmed by existing experiments, and define the critical temperatures of (quasi)condensation and the integral particle lifetime dependencies on the detuning. Large positive detunings are shown to provide conditions for the total lifetime reaching nanosecond timescales. This allows realization of thermodynamically equilibrium polariton systems with Bose-Einstein condensate forming at temperatures as high as tens of Kelvin.
Только метаданные
Dark and thermal reservoir contributions to polariton sound velocity
(2022) Grudinina, A. M.; Voronova, N. S.; Грудинина, Анна Михайловна; Воронова, Нина Сергеевна
Только метаданные
Topologically driven Rabi-oscillating interference dislocation
(2022) Rahmani, A.; Colas, D.; Jamshidi-Ghaleh, K.; Dominici, L.; Voronova, N.; Воронова, Нина Сергеевна
© 2022 Amir Rahmani et al., published by De Gruyter, Berlin/Boston 2022.Quantum vortices are the quantized version of classical vortices. Their center is a phase singularity or vortex core around which the flow of particles as a whole circulates and is typical in superfluids, condensates and optical fields. However, the exploration of the motion of the phase singularities in coherently-coupled systems is still underway. We theoretically analyze the propagation of an interference dislocation in the regime of strong coupling between light and matter, with strong mass imbalance, corresponding to the case of microcavity exciton-polaritons. To this end, we utilize combinations of vortex and tightly focused Gaussian beams, which are introduced through resonant pulsed pumping. We show that a dislocation originates from self-interference fringes, due to the non-parabolic dispersion of polaritons combined with moving Rabi-oscillating vortices. The morphology of singularities is analyzed in the Poincaré space for the pseudospin associated to the polariton states. The resulting beam carries orbital angular momentum with decaying oscillations due to the loss of spatial overlap between the normal modes of the polariton system.
Только метаданные
Tunable Bose-Einstein condensation and rotonlike excitation spectra with dipolar exciton-polaritons in crossed fields
(2023) Maximov, T. V.; Kurbakov, I. L.; Voronova, N. S.; Lozovik, Y. E.; Воронова, Нина Сергеевна
Только метаданные
Coupled system of electrons and exciton-polaritons: Screening, dynamical effects, and superconductivity
(2023) Plyashechnik, A. S.; Sokolik, A. A.; Voronova, N. S.; Lozovik, Y. E.; Воронова, Нина Сергеевна
Только метаданные
Coupled quantum vortex kinematics and Berry curvature in real space
(2023) Dominici, L.; Rahmani, A.; Colas, D.; Ballarini, D.; Voronova, N. S.; Воронова, Нина Сергеевна