Crystal optics with allowance for spatial dispersion; exciton theory. II

Agranovich, V.M.; Ginzburg, Vitalii L.

doi:10.3367/ufnr.0077.196208i.0663

Cited by 22 publications

(3 citation statements)

References 6 publications

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“…The total permittivity of the medium that accounts for contributions (12) and (13) has the form: In order to obtain the dispersion relations for polariton eigenmodes, one should solve the dispersion equation [4]:…”

Section: Original Papermentioning

confidence: 99%

“…In particular, this concerns the transitions from or to exciton states with large wave vectors, K > q, where q is the wave vector of light at the exciton resonance frequency. This symmetry lowering leads to the appearance of quasiperiodic spectral oscillations in reflectivity spectra [3,4]. Multiple experimental studies show that these oscillations manifest quantization of the center-ofmass exciton motion [2,[5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Reduction of exciton mass by uniaxial stress in GaAs/AlGaAs quantum wells

Loginov

Grigoryev

Efimov

et al. 2016

Phys. Status Solidi B

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Abstractauthoren We show experimentally that the uniaxial stress applied along the twofold symmetry axis of a high‐quality heterostructure containing a wide GaAs/AlGaAs quantum well leads to considerable modification of the exciton‐polariton reflectivity spectra. We observe: (i) the energy splitting of the light‐hole and heavy‐hole exciton resonances to appear and (ii) the increase of the quasiperiod (divergence) of spectral oscillations related to the optically allowed exciton‐polariton transitions. A theoretical analysis shows that the first effect is due to the strain‐induced reduction of crystal symmetry. The divergence of spectral oscillations is found to be due to the strain‐induced decrease of the heavy‐hole exciton mass. The effective mass is reduced by 5% at the pressure of P=0.23GPa. This effect shows the potentiality of spectroscopic ways of strain detection in semiconductors.

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Section: Original Papermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reduction of exciton mass by uniaxial stress in GaAs/AlGaAs quantum wells

Loginov

Grigoryev

Efimov

et al. 2016

Phys. Status Solidi B

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“…where the last term in the left-hand part o f the equa tion describes the induced current of electrons in the m edium w ithin the high-frequency approxim ation ((£>> I, I being the average ionization potential of atoms in the target), which allows the atom ic frequen cies to be ignored in com parison to co in the energycontaining denominators of the form ula for atomic polarizability [14] and the asymptotic form ula (1) to be used; Z is the num ber o f electrons in the atom , R is the radius o f electron screening o f the atom ic nucleus; and (i is a function that describes the individual con tributions o f all target atoms with coordinates rh For the subsequent analysis, it is convenient to rep resent function (i as a sum o f the average (refraction) and fluctuation (scattering) com ponents as follows:…”

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confidence: 99%

Effect of acoustic wave on the parametric X-ray generation by relativistic electrons in a crystal

et al. 2010

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Abstract-An exhaustive description of the parametric X-ray (PXR) generation by relativistic electrons in a crystal excited by an acoustic wave is proposed. A principal question as to whether it is possible to enhance the PXR yield under these conditions is considered.Increasing interest in the analysis of high-energy electromagnetic processes in oriented crystals under the action o f external factors (e.g., acoustic waves) is related to the possibility o f controlling these processes. In particular, the effect o f acoustic waves was studied w ith respect to the coherent bremsstrahlung radiation [ 1,2], coherent electron-positron pair production in a crystal [3,4], diffraction of free photons [5,6], X-ray transition radiation [7], and param etric X-ray (PXR) generation [8][9][10][11][12][13].

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Halbklassische Selbstkonsistenztheorie der Polaritonen in Molekülkristallen in Dipolnäherung

Wünsche¹

1973

Annalen der Physik

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InhaltsubersichtAusgehend von den beiden verhiiltnismiiBig leicht losbaren Teilproblemen der Bestimmung der Reaktion eines Molekuls auf ein zu diesem Molekul iiuBeres elektrisches Feld in Dipolnilherung und der Bestimmung des von einem bekannkn Dipolmoment erzeugten elektrischen Feldes wird das Selbstkonsistenzproblem ffir die Gesamtheit der lokalen elektrischen Feldstiirken in einem idealen Molekulkristall mit einem Molekul pro Elementarzelle gestellt. Man erhiilt eine, im Falle der linearen Optik lineare homogene vektorielle Polaritonengleichung fur die Fomm-Transformierten der lokalen Feldstiirken, in welche die Eigenschaften des Gitters in Form eines Gittersummenknsors eingehen, der in eine Reihe nach Potenzen des Wellenvektors und der Frequenz entwickelt wird. Die Polaritonengleichungen werden in nullter Niiherung fur optisch einachsige Medien diskutiert, wobei sich u. a. Verallgemeinerungen der Formeln von CLAUSIUS-MOSSOTTI bzw. LORENTZ-LORENZ ergeben. In der Niihe von Molekulubergangsfrequenzen ergeben sich interessante Verzweigungen des Usungstyps der auBerordentlichen Wellen zu fastlongitudinalen und fasttransversalen Wellen. Fiir die 3 kubischen Gittertypen wird noch die zweite Niiherung des Gittersummentensora bei numerischer Auswertung nach der EwALDschen Methode gewonnen. Sie beschreibt Effekte der riiumlichen Dispersion. 7 Ann. Physik. 7. F o b , Bd. SO

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Crystal optics with allowance for spatial dispersion; exciton theory. II

Cited by 22 publications

References 6 publications

Reduction of exciton mass by uniaxial stress in GaAs/AlGaAs quantum wells

Reduction of exciton mass by uniaxial stress in GaAs/AlGaAs quantum wells

Effect of acoustic wave on the parametric X-ray generation by relativistic electrons in a crystal

Halbklassische Selbstkonsistenztheorie der Polaritonen in Molekülkristallen in Dipolnäherung

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