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Лебедев Владимир Валентинович

Международная лаборатория физики конденсированного состояния

Профиль на hse.ru ↗ тел.: 15234
Публикаций
71
Языков
1
Наград
11
Конференций
0
Профиль Публикации (71) Курсы (6)

Профессиональные интересы

Динамические свойства сильно неравновесных систем и мягкой материи: турбулентность, динамика полимерных растворов, динамика жидких кристаллов, динамика биологических мембран.

Должности

  • Главный научный сотрудник — Международная лаборатория физики конденсированного состояния
  • Профессор — Факультет физики
  • Академический руководитель образовательной программы — Физика

Био

  • · Начал работать в НИУ ВШЭ в 2016 году.
  • · Научно-педагогический стаж: 55 лет.

Образование

  • 2003 · Член-корреспондент РАН
  • 1990 · Доктор физико-математических наук
  • 1979 · Кандидат физико-математических наук
  • 1976 · Специалитет: Московский физико-технический институт, факультет: ФОПФ, специальность «Автоматика и электроника», квалификация «Инженер-физик»

Опыт работы

  • · Академический руководитель магистерской программы на факультете физики НИУ ВШЭ.
  • · Чтение лекций для студентов НИУ ВШЭ и МФТИ.
  • · 2003—2018: директор Института теоретической физики имени Л.Д.Ландау РАН
  • · 8 лет заведующий лабораторией современной гидродинамики, руководство студентами и аспирантами, более 150 публикаций в рецензируемых журналах.

Награды и поощрения

  • · Благодарность проректора НИУ ВШЭ (январь 2026)
  • · Благодарность проректора НИУ ВШЭ (январь 2025)
  • · Благодарность декана факультета физики НИУ ВШЭ (январь 2023)
  • · Надбавка за публикацию в журнале из Списка А (и приравненном к нему научном издании) (2025–2026, 2024–2025, 2023–2024)
  • · Надбавка за публикацию в международном рецензируемом научном издании (2022–2023, 2021–2022, 2019–2021, 2017–2018)
  • · Лучший академический руководитель в номинации «Прием иностранных студентов» — 2025
  • · Лучший академический руководитель в номинации «Сбалансированность образования» — 2025
  • · Лучший академический руководитель в номинации «Лояльность студентов к продолжению образования в НИУ ВШЭ» — 2023–2024
  • · Лучший академический руководитель в номинации «Удовлетворенность студентов качеством образовательной программы» — 2024
  • · Лучший академический руководитель в номинации «Привлечение студентов» — 2023
  • · Лучший академический руководитель в номинации «Работа студентов с внешними заказчиками» — 2023

Гранты и проекты

  • 2016 · Парфеньев Владимир Михайлович, ««Нелинейные явления в плазмонике и гидродинамике: теория спазера и генерация завихренности поверхностными волнами»» Кандидатская диссертация, научный руководитель: Лебедев В.В., 01.04.02 — теоретическая физика Дата защиты: 30 декабря 2016 Текст диссертации выложен на сайте ИТФ им. Л.Д.Ландау РАН 17 июня 2016г.
  • 2016 · Белан Сергей Александрович, ««Статистические модели динамики инерционных частиц в пространственно-неоднородных турбулентных течениях»» Кандидатская диссертация, научный руководитель: Лебедев В.В., 01.04.02 — теоретическая физика Дата защиты: 30 декабря 2016 Текст диссертации выложен на сайте ИТФ им. Л.Д.Ландау РАН 17 июня 2016г.

Идентификаторы исследователя

  • ORCID: 0000-0002-2932-4856
  • ResearcherID: K-1858-2017
  • SPIN РИНЦ: 6595-7991
  • Scopus AuthorID: 8971405800

Публикации (71)

Puch coalescence as a mechanism for eukayotic directional sensing

2007 · ARTICLE · en

Eukaryotic cells possess a sensible chemical compass allowing them to orient toward sources of soluble chemicals. The extracellular chemical signal triggers separation of the cell membrane into two domains populated by different phospholipid molecules and oriented along the signal anisotropy. We propose a theory of this polarization process, which is articulated into subsequent stages of germ nucleation, patch coarsening, and merging into a single domain. We find that the polarization time, t, depends on the anisotropy degree  through the power law t / 2, and that in a cell of radius R there should exist a threshold value th / R1 for the smallest detectable anisotropy

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Dynamics of energy condensation in two-dimensional turbulence

2007 · ARTICLE · en

We report a numerical study, supplemented by phenomenological explanations, of ‘‘energy condensation’’ in forced 2D turbulence in a biperiodic box. Condensation is a finite size effect which occurs after the standard inverse cascade reaches the size of the system. It leads to the emergence of a coherent vortex dipole. We show that the time growth of the dipole is self-similar, and it contains most of the injected energy, thus resulting in an energy spectrum which is markedly steeper than the standard k5=3 one. Once the coherent component is subtracted, however, the remaining fluctuations have a spectrum close to k1. The fluctuations decay slowly as the coherent part grows.

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Polymer statistics in a random flow with mean shear

2005 · ARTICLE · en

We consider the dynamics of a polymer with finite extensibility placed in a chaotic flow with large mean shear, to explain how the polymer statistics changes with Weissenberg number, Wi, the product of the polymer relaxation time and the Lyapunov exponent of the flow, ¯ λ. The probability distribution function (PDF) of the polymer orientation is peaked around a shear-preferred direction, having algebraic tails. The PDF of the tumbling time (separating two subsequent flips), τ , has a maximum estimated as ¯λ−1. This PDF shows an exponential tail for large τ and a small-τ tail determined by the simultaneous statistics of the velocity PDF. Four regimes of Wi are identified for the extension statistics: one below the coil–stretched transition and three above the coil–stretched transition. Emphasis is given to explaining these regimes in terms of the polymer dynamics.

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Effects of surface tension on immiscible Rayleigh-Taylor turbulence

2005 · ARTICLE · en

We present phenomenology describing the internal structure of a turbulent zone, produced as the result of the push of a heavy fluid into a light one, for the case of immiscible fluids. One finds that the Kolmogorov cascade is realized within a range that grows with time, viz., scales between the mixing zone width, L~t2, and the viscous scale, h ~t−1/4. Surface-tension effects lead to formation of an emulsionlike state. Density fluctuations on scales larger than the typical drop size, l, are governed by the Obukhov-Corrsin cascade. If l@h, a wave energy cascade, related to capillary waves propagating along the surfaces of drops, is formed at scales below l, l~t−2/5.

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Non-Gaussian error probability in optical soliton transmission

2004 · ARTICLE · en

We find the probability distribution of the fluctuating parameters of a soliton propagating through a medium with additive noise. Our method is a modification of the instanton formalism (method of optimal fluctuation) based on a saddle-point approximation in the path integral. We first solve consistently a fundamental problem of soliton propagation within the framework of noisy nonlinear Schrödinger equation.We then consider model modifications due to in-line (filtering, amplitude and phase modulation) control. It is examined howcontrol elements change the error probability in optical soliton transmission. Even though a weak noise is considered, we are interested here in probabilities of error-causing large fluctuations which are beyond perturbation theory. We describe in detail a new phenomenon of soliton collapse that occurs under the combined action of noise, filtering and amplitude modulation

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PMD induced fluctuations of Bit-Error-Rate in optical fiber systems

2004 · ARTICLE · en

This paper presents a method that allows evaluating the performance of an optical fiber system where bit errors result from a complex interplay of spontaneous noise generated in optical amplifiers and birefringent disorder of the transmission fiber. We demonstrate that in the presence of temporal fluctuations of birefringence characteristics, the bit-error rate (BER) itself is insufficient for characterizing system performance. Adequate characterization requires introducing the probability distribution function (PDF) of the BER obtained by averaging over many realizations of birefringent disorder. Our theoretical analysis shows that this PDF has an extended tail indicating the importance of anomalously large values of BER.We present the results of comprehensive analysis of the following issues: 1) The dependence of the PDF tail shape on detection details, such as filtering and regular temporal shift adjustment; 2) the changes in the PDF of BER that occur when the first- or higher order polarization mode dispersion (PMD) compensation techniques are applied; 3) an alternative PMD compensation method capable of providing more efficient suppression of extreme outages.

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Extreme outages caused by polarization mode dispersion

2003 · ARTICLE · en

We study the dependence on fiber birefringence of the bit-error rate (BER) caused by amplifier noise in a linear optical fiber telecommunication system. We show that the probability-distribution function of the BER obtained by averaging over many realizations of birefringent disorder has an extended tail that corresponds to anomalously large values of BER. We specifically discuss the dependence of the tail on such details of pulse detection at the fiber output as setting the clock and filtering procedures.

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Probability of anomalously large bit-error rate in long haul optical transmission

2003 · ARTICLE · en

We consider a linear model of optical transmission through a fiber with birefringent disorder in the presence of amplifier noise. Both disorder and noise are assumed to be weak, i.e., the average bit-error rate (BER) is small. The probability distribution function (PDF) of rare violent events leading to the values of BER much larger than its typical value is estimated. We show that the PDF has a long algebraiclike tail.

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Shedding and interaction of solitons in weakly disordered optical fibers

2003 · ARTICLE · en

The propagation of the soliton pattern through optical fiber with weakly disordered dispersion coefficient is considered. Solitons perturbed by this disorder radiate and, as a consequence, decay. The average radiation profile is found. Emergence of a long-range intrachannel interaction between the solitons ~mediated by this radiation! is reported. We show that soliton in a multisoliton pattern experiences a random jitter: intersoliton separation is zero mean Gaussian random field. Fluctuations of this separation are estimated by d y ;Dz2Am, where D measures the disorder strength, z is the propagation distance, and m stands for the transmission rate ~number of solitons per unit length of the fiber!. Direct numerical simulations are used to validate theoretical predictions for single soliton decay and two-soliton interaction. Relevance of these results to fiber optics communication technology is discussed.

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Compensation for extreme outages caused by polarization mode dispersion and amplifier noise

2003 · ARTICLE · en

Fluctuations of Bit-Error-Rate (BER) stimulated by birefringent disorder in an optical fiber system are found to be strong. The effect may not be analyzed in terms of the average BER but rather requires analyzing the Probability Distribution Function (PDF) of BER. We report the emergence of the extremely extended algebraic-like tail of the PDF, corresponding to anomalously large values of BER. We analyze the dependence of the PDF tail, and thus the outage probability, on the first-order PMD compensation scheme. Effectiveness of compensation is illustrated quantitatively using a simple, however, practical example.

DOI ↗ PDF ↗

Курсы (6)