Renat Kh. Gainutdinov

Kazan (Volga Region) Federal University, Kasan, Tatarstan, Russia

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Publications (48)13.35 Total impact

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    ABSTRACT: The self-interaction of a quantum dot tunnel with Coulomb interaction coupled to two noninteracting leads is investigated. The self-energy function describing this interaction is added to a bare energy of a dot state. In the standard way of determining the self-interaction (tunneling-induced) corrections to bare energies of emitters (atoms, quantum dots, etc) the variations of the self-energy functions with energy are ignored, and these corrections are considered to be equal to the values of the self-energy functions for bare energies of states. We show that actually in the case of quantum dots the variations of the self-energy functions in the energy interval between the bare and true energies can be strong, and this can have a significant effect on the values of the tunneling-induced shifts of energy levels of quantum dots.
    Journal of Physics Conference Series 05/2015; 613(1). DOI:10.1088/1742-6596/613/1/012002
  • M Kh Salakhov, V V Samartsev, R Kh Gainutdinov
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    ABSTRACT: Kazan Federal University has held the annual International Youth School "Coherent Optics and Optical Spectroscopy" since 1997. The choice of the topic is not accidental. Kazan is the home of photon echo which was predicted at Kazan Physical-Technical Institute in 1963 by Prof. U.G. Kopvil'em and V.R. Nagibarov and observed in Columbia University by N.A. Kurnit, I.D. Abella, and S.R. Hartmann in 1964. Since then, photon echo has become a powerful tool of coherent optical spectroscopy and optical information processing, which have been developed here in Kazan in close collaboration between Kazan Physical-Technical Institute and Kazan Federal University. The main subjects of the XVIII International Youth School are: Nonlinear and coherent optics; Atomic and molecular spectroscopy; Coherent laser spectroscopy; Problems of quantum optics; Quantum theory of radiation; and Nanophotonics and Scanning Probe Microscopy. The unchallenged organizers of that school are Kazan Federal University and Kazan E.K. Zavoisky Physical-Technical Institute. The rector of the School is Professor Myakzyum Salakhov, and the vice-rector is Professor Vitaly Samartsev.
    Journal of Physics Conference Series 05/2015; 613(1). DOI:10.1088/1742-6596/613/1/011001
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    ABSTRACT: The self-interaction of an electron in the photonic crystal medium is investigated. We show that modification of the self-interaction of electrons in photonic crystals is very significant and, as a consequence, at some photon frequencies the electron-light interaction becomes effectively strong.
    Journal of Physics Conference Series 05/2015; 613(1). DOI:10.1088/1742-6596/613/1/012001
  • R Kh Gainutdinov, A A Mutygullina, A S Petrova
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    ABSTRACT: Spontaneous emission from atoms with unstable nuclei is investigated. The decay law of an unstable nucleus is shown to be not exponential and to depend on a parameter characterizing the self-interaction of the unstable nucleus. This parameter, as well as the decay width, can be extracted from the line profile. It is demonstrated on the instance of Beryllium atom with the unstable neutron-rich 13Be nucleus that for light atoms this parameter may have an essential effect on their spontaneous emission spectrum. Spontaneous emission from supercritical atoms is investigated as well. Their spectrum is continuous and depends on the decay width of the supercritical nucleus. The most sensitivity to the magnitude of the decay width is observed in the X-ray band.
    Journal of Physics Conference Series 05/2015; 613(1). DOI:10.1088/1742-6596/613/1/012003
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    ABSTRACT: We propose experimental confirmation of the new effect of the electron mass changes in photonic crystal medium, which was recently predicted. The method consists in measuring the Lamb shift in hydrogen atoms placed in the medium of photonic crystal. We discuss the experimental scheme based on the Lamb and Retherford experiment as well as the requirements for the samples of photonic crystals.
    Journal of Physics Conference Series 05/2015; 613(1). DOI:10.1088/1742-6596/613/1/012005
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  • R. Kh. Gainutdinov, M. A. Khamadeev, M. Kh. Salakhov
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    ABSTRACT: The effect of a change in the mass of an electronin a photonic crystal on the physicochemical processes in the latter is studied. The shift in the atomic energy levels of hydrogen due to this effect is calculated.
    Bulletin of the Russian Academy of Sciences Physics 12/2014; 77(12):1440-1443. DOI:10.3103/S1062873813120034
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    ABSTRACT: We investigate the energy dependence of self-energy functions of quantum-dot states that describe the interaction of quantum dots with vacuum. It is shown that the variation of these self-energy functions can be significant and this can have a significant effect on processes of quantum interference from quantum dots.
    Journal of Physics Conference Series 11/2014; 560(1). DOI:10.1088/1742-6596/560/1/012006
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    ABSTRACT: We show that Van Hove singularities in the behavior of the photon density of states in a photonic crystal results in a singular behavior of the self-energy functions of atomic states that describe the interaction of the atom with vacuum. This is shown to have a significant effect on processes of quantum interference from atoms in the PC medium.
    Journal of Physics Conference Series 11/2014; 560(1). DOI:10.1088/1742-6596/560/1/012007
  • R. Kh. Gainutdinov, A. A. Mutygullina
    Bulletin of the Russian Academy of Sciences Physics 02/2014; 78(3). DOI:10.3103/S106287381403006X
  • R. Kh. Gainutdinov, M. A. Khamadeev, M. Kh. Salakhov
    Bulletin of the Russian Academy of Sciences Physics 02/2014; 78(3). DOI:10.3103/S1062873814030071
  • R. Kh Gainutdinov, A. A. Mutygullina
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    ABSTRACT: We show that for some intensities of a driving laser field not only the laser modes but also the vacuum ones are involved into the strong atom-laser interaction and this has a significant effect on processes of resonance fluorescence.
    Journal of Physics Conference Series 11/2013; 478(1). DOI:10.1088/1742-6596/478/1/012018
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    ABSTRACT: We show that the light spectra of atoms with a superheavy nucleus may be important for our understanding of the processes in supercritical fields. The shape is obtained of a spectral line emitted by an atom with a superheavy nucleus. We study the connection of the light part of the spectrum with the parameters characterizing the nucleus decay.
    Journal of Physics Conference Series 11/2013; 478(1). DOI:10.1088/1742-6596/478/1/012019
  • R. Kh Gainutdinov, M. A. Khamadeev, M. Kh Salakhov
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    ABSTRACT: We study a recently predicted novel-type quantum electrodynamical effect that takes place in the photonic crystal medium. It consists in the fact that the modification of the interaction of a charged particle with its own radiation field in the photonic crystal medium results in the change in its mass. Consequences and possible applications of this effect are discussed. It is shown that, as a consequence of the effect, spectrum of the light emitted by atoms may be profoundly modified if, instead of being in free space, atoms are enclosed in air voids of a photonic crystal. Spectral lines of atoms in the photonic crystal medium are shifted in frequency, and this shift may be comparable to the atomic transition frequencies in free space.
    Journal of Physics Conference Series 11/2013; 478(1). DOI:10.1088/1742-6596/478/1/012017
  • R. Kh. Gainutdinov, M. Kh. Salakhov, M. A. Khamadeev
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    ABSTRACT: The influence of a photonic crystal medium on the character of the interaction of electrons with their own radiation field is studied. As was recently shown, this influence changes the electromagnetic mass of the electrons in photonic crystals. This alters atomic energy levels. The dependence of this effect on the optical contrast of photonic crystals is studied.
    Bulletin of the Russian Academy of Sciences Physics 12/2012; 76(12). DOI:10.3103/S106287381212012X
  • A. A. Vasil’ev, R. Kh. Gainutdinov, A. A. Mutygullina
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    ABSTRACT: Based on the generalized dynamical equation, vacuum polarization effects are studied within the scope of the bound state theory in quantum electrodynamics. We find a vacuum-polarization correction to the Lamb shift for the 1S state of the hydrogen atom on the order of (α/π)2(Zα)4 that is not considered in the standard theory of bound states in quantum electrodynamics.
    Bulletin of the Russian Academy of Sciences Physics 03/2012; 76(3). DOI:10.3103/S1062873812030380
  • R. Kh. Gainutdinov, A. A. Mutydullina, M. A. Khamadeev
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    ABSTRACT: The instability of an electron-positron vacuum in an intense laser field is studied. An equation describing the decay of the electron-positron vacuum in the focal region of two strong opposing laser beams is derived on the basis of the generalized dynamical equation.
    Bulletin of the Russian Academy of Sciences Physics 03/2012; 76(3). DOI:10.3103/S1062873812030094
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    Renat Kh. Gainutdinov, Marat A. Khamadeev, Myakzyum Kh. Salakhov
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    ABSTRACT: Photonic crystals are periodic systems that consist of dielectrics with different refractive indices. They are designed to act on photons in contrast to semiconductor crystals whose periodicity affects the motion of electrons. Here we consider the interaction of an atomic electron with its own radiation field in the case when the atom is placed in air voids of a photonic crystal and is not in mechanical contact with the vibrational degrees of freedom of the dielectric host. A strong modification of this interaction from that in free space is shown to change the rest mass of the electron, and this has a significant effect on the shift of the atomic energy levels. This shift is investigated by using the example of atomic hydrogen in a high-index-contrast photonic crystal. The found effect may be of interest both from fundamental and practical points of view.
    Physical Review A 12/2011; 85(5). DOI:10.1103/PhysRevA.85.053836 · 2.99 Impact Factor
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    Renat Kh. Gainutdinov
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    ABSTRACT: The result of a recent measurement of the size of the proton [R. Pohl et al., Nature 466, 213] performed on the base of the muonic hydrogen spectroscopy turned out to be significantly different, by five standard deviations, from the results derived from the atomic hydrogen spectroscopy. This large discrepancy could come from the calculations of the Lamb shift in atomic hydrogen and muonic hydrogen. Here we show that there is a gap in the standard bound-state QED that may be the source of the discrepancy. This gap originates in the fact that within the framework of this theory the QED corrections are described in terms of the respective Green functions. The character of the time evolution of a system which should manifest itself in the general definition of bound states as stationary states of the system cannot be described in terms of the Green functions. We present a consistent way of solving the bound-state problem in QED starting from the condition of stationarity of the bound states. Formulae for the energies and the vectors of the states of one-electron (muon) atoms derived in this way indicate that the standard bound-state QED does not obey the exact description of the atomic states and, as a result, the Lamb shift obtained in its framework should be supplemented by an additional "dynamical" energy shift. It is shown that in this shift natural nonlocality of the electromagnetic interaction that in describing the S matrix and the Green functions is hidden in the renormalization procedure manifest itself explicitly.
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    ABSTRACT: Quantum electrodynamic bound states in strong electromagnetic fields are considered. It is shown that the dynamics of the system can not be described completely in the adiabatic S-matrix approach. Vacuum polarization effects in muonic atoms are studied using the paradigm of generalized quantum dynamics. This approach leads to additional correction terms.
    Bulletin of the Russian Academy of Sciences Physics 07/2010; 74(7):963-965. DOI:10.3103/S1062873810070166