TITLE

An Analog of the Migdal–Kohn Singularity and the Radiation Width of the High-Frequency Branch of the Polariton Spectrum for a Bounded Crystal of the J-Aggregate Type

AUTHOR(S)
Dubovsky, O. A.
PUB. DATE
February 2004
SOURCE
Journal of Experimental & Theoretical Physics;Feb2004, Vol. 98 Issue 2, p240
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The excitation spectra of crystalline ensembles of coherently emitting interacting quantum electric dipole oscillators are investigated. The system of dynamic equations derived for a one-dimensional crystal of the J-aggregate type can be used in various limiting cases for studying optical photons as well as X-ray and gamma quanta. An exact analytic solution to the dispersion equation is obtained for polaritons (mixed states of Frenkel excitons and transverse photons). It is shown that the high-frequency polariton branch with anomalously high radiation broadening has the limiting wave vector corresponding to the spectral edge not because the broadening becomes comparable to the frequency (as was generally accepted earlier), but due to smooth joining of this polariton branch with the other (nonphysical) branch determined from the dispersion equation. At this point, the derivative of the dispersion curve goes to infinity, which is an analog of the well-known Migdal–Kohn singularity in the phonon spectra of metals. It is shown that the low-frequency polariton branch also exhibits slight broadening due to the fact that the proper radiation width is taken into account exactly. © 2004 MAIK “Nauka / Interperiodica”.
ACCESSION #
12461272

 

Related Articles

  • Parametric Frequency Conversion in Layered Nonlinear Media. Kitaeva, G. Kh; Penin, A. N. // Journal of Experimental & Theoretical Physics;Feb2004, Vol. 98 Issue 2, p272 

    Frequency-angular distributions of signal wave intensity are calculated for spontaneous parametric down-conversion and parametric frequency conversion in spatially nonuniform nonlinear media. Wave reflection from interfaces is taken into account, and both regular and irregular nonuniform...

  • Longitudinal coherence length of an optical field. Ryabukho, V. P.; Lyakin, D. V.; Lychagov, V. V. // Optics & Spectroscopy;Aug2009, Vol. 107 Issue 2, p282 

    Longitudinal coherence of an optical field depending on the parameters of its frequency and angular spectra is considered. Expressions for the function and length of longitudinal coherence depending on the width of the frequency and angular spectra are obtained. The competitive influence of the...

  • Mapping of periodically poled crystals via spontaneous parametric down-conversion. Kitaeva, G.; Tishkova, V.; Naumova, I.; Penin, A.; Kang, C.; Tang, S. // Applied Physics B: Lasers & Optics;Sep2005, Vol. 81 Issue 5, p645 

    A new method for characterization of periodically poled crystals is developed based on spontaneous parametric down-conversion. The method is demonstrated on crystals of Y:LiNbO3, Mg:Y:LiNbO3 with non-uniform periodically poled structures, obtained directly under the Czochralski growth procedure...

  • Crystal Monochromator based Emittance Measurements at the PETRA Undulator Beamline. Hahn, U.; Schulte-Schrepping, H.; Warwick, T. // AIP Conference Proceedings;2004, Vol. 705 Issue 1, p533 

    The synchrotron radiation beamline at the PETRA storage ring at DESY with two end stations uses a 4 m-long undulator delivering hard X-ray photons up to 300 keV at a storage ring energy of 12 GeV. The spatial photon intensity distribution at the first undulator harmonic (21.23 keV) was used to...

  • Dynamic Performance Testing of Excluded Spectra Range of Band- Stop-Filter. Gwanggil Jeon // International Journal of Control & Automation;Jun2013, Vol. 6 Issue 3, p347 

    This paper studies about band-stop-filter which attenuates certain areas, and passes very high and very low band of frequencies. We study the influence of excluded spectra range by evaluating MSE and PSNR performance. Simulation results confirm that accepting more high frequency energy improves...

  • Features of thin spatial structure of the quasar 3C216 at decameter lengths of waves. Megn, A. V.; Rashkovskiy, S. L.; Shepelev, V. A.; Inytin, G. A.; Vashchishin, R. V.; Brazhenko, A. I.; Koshoviy, V. V.; Lozinskiy, A. B. // AIP Conference Proceedings;1/1/2010, Vol. 1206 Issue 1, p354 

    The results of interferometric researches of the quasar 3C216 have been presented. The model of brightness distribution of the quasar at frequencies of 20 and 25 MHz and spectra of its details at frequencies below 1 GHz have been refined. It was found out, that at decameter lengths the radio...

  • In-beam γ-ray spectroscopy of42Ca. Lach, M.; Styczeń, J.; Meczyński, W.; Bednarczyk, P.; Bracco, A.; Grebosz, J.; Maj, A.; Merdinger, J. C.; Schulz, N.; Smith, M. B.; Spohr, K. M.; Vivien, J. P.; Ziebliński, M. // European Physical Journal A -- Hadrons & Nuclei;Mar2003, Vol. 16 Issue 3, p309 

    High-spin states of the42Ca nucleus, populated in the 68 MeV18O +30Si reaction, have been studied in a γ-γ-recoil coincidence experiment. The level scheme of42Ca has been extended up to 13.7 MeV. An elaborate decay pattern with various paths, together with high-quality DCO and polarization...

  • Spatial Fourier spectroscopy. N. Vlasov; G. Kalenkov // Measurement Techniques;Apr2008, Vol. 51 Issue 4, p378 

    Abstract  A brief analytic survey of the early studies devoted to the development of a spatial analog of Fourier spectroscopy and its principal advantage, the extension of the range of application to the study of high-speed processes, is given.

  • Multimode resonances in metallically confined square-resonator microlasers. Kai-Jun Che; Yue-De Yang; Yong-Zhen Huang // Applied Physics Letters;2/1/2010, Vol. 96 Issue 5, p051104 

    Directional emission InP/AlGaInAs square-resonator microlasers with a side length of 20 μm are fabricated by standard photolithography and inductively coupled-plasma etching technique. Multimode resonances with about seven distinct mode peaks in a free-spectral range are observed from 1460 to...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics