On the Theory of Electroabsorption in Polar Crystals

Röseler, J.; Henneberger, K.; Strehlow, Roger A.

doi:10.1002/pssb.2220730221

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…The interesting question about the connection between microscopic and macroscopic theory will be investigated in a further paper [9]. All experimental data used for calculating the curves in the present paper are listed in the Appendix.…”

Section: Introductionmentioning

confidence: 98%

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Magnetopolaritons in Wurtzite‐Type Crystals

Röseler

Henneberger

1979

Physica Status Solidi (b)

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The influence of a magnetic field on the polariton dispersion resulting from the & = I excitons in wurtzite-type crystals is calculated by the diagonalization of the Hamiltonian describing niagnetoexciton-photon interaction. Remarkable changes compared with the field-free dispersion are obtained: Beside energy shifts, new branches and crossing points arise due to the field-induced mixing of exciton states. The results should be interesting also with respect to final states of the radiative decay of biexcitons in crystals like CdS and CdSe.

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Section: Introductionmentioning

confidence: 98%

“…Adding the Hamiltonian 1 c ) 3. The polarization directions of excitons are not changed by the magnetic field [9], but the magnetic field doubles the nuniber of polarized excitons.…”

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Magnetopolaritons in Wurtzite‐Type Crystals

Röseler

Henneberger

1979

Physica Status Solidi (b)

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On the Electron–Phonon and Exciton–Phonon Interaction in ZnTe

Friedrich¹,

Ozerov²,

Strehlow³

et al. 1978

Physica Status Solidi (b)

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The ,?-modulated reflectance spectrum of ZnTe is investigated in the spectral region above the energy of the exciton ground state Eexl. Structures are observed near the energy Eexl + h o , (fro, is the LO-phonon energy) and a t the energy E, + 1.3 hw, ( E g is the gap energy). In accordance with similar results obtained in a lot of other 11-VI compounds the first of these structures is interpreted from the point of view of the exciton-phonon complex formation. The second structure not observed experimentally so far is ascribed to a polaron effect. I n order to support this interpretation the existing theory of this polaron effect is extended to the determination of the spectral dependence of the real part of the dielectric function. This allows the determination of the behaviour of the reflectance R and of the derivative dR/dl. The theoretical results are in quite good agreement with the experimentally observed spectrum.Das wellenliingenmodulierte Reflexionsspektrum von ZnTe wird im Spektralbereich oberhalb der Energie des Exzitonengrundzustandes Eesl untersucht. Es werden Strukturen in der Nahe der Energie Eexl + fro, (ho, ist die LO-Phononenenergie) und bei der Energie E , + 1,3 ho, ( E s ist die Breite der verbotenen Zone) beobachtet. I n Ubereinstimmung mit ghnlichen Ergebnissen, die a n einer Reihe anderer 11-VI-Verbindongen erzielt worden sind, wird die erste dieser Struktriren vom Standpunkt der Exziton-Phonon-Komplexbildung interpretiert. Die zweite bisher experimentell nicht beobachtete Struktur wird mit einem durch Polaronen verursachten Effekt in Zusammenhang gebracht. Um diese Interpretation zu stutzen, wird die Theorie dieses Polaroneneffektes auf die Berechnung des Realteils der dielektrischen Funktion erweitert. Das gestattet die Bestimmung der Spektralabhangigkeit des Reflexionsvermogens R und der Ableitung dR/dl. Die theoretischen Ergebnisse stimmen gut mit dem experimentell beobachteten Spektrum iiberein.

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Reflectance and electroreflectance of TiO₂single crystals. II. Assignment to electronic energy levels

Vos

1977

J. Phys. C: Solid State Phys.

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For pt.I see ibid., vol.10, no.19, p.3893 (1977). The interband optical properties of TiO2 are analysed on the basis of a tight-binding band structure which is calculated by using estimated values for the LCOAO parameters. The major interband transitions giving rise to the pronounced optical structure around 4 eV occur between energy band regions near the Sigma symmetry line of the Brillouin zone. The broad structure of the electroreflectance (ER) is mainly caused by the energy shift of these bands due to the dielectric polarisation. Values for four elements of the polarisation-potential tensor have been deduced from the experimental data which agree with the results of a quantitative model developed for the electro-optic effect. Some features of the ER fine structure are unambiguously identified as Franz-Keldysh oscillations and are designated to specific critical points.

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On the Theory of Electroabsorption in Polar Crystals

Cited by 3 publications

References 11 publications

Magnetopolaritons in Wurtzite‐Type Crystals

Magnetopolaritons in Wurtzite‐Type Crystals

On the Electron–Phonon and Exciton–Phonon Interaction in ZnTe

Reflectance and electroreflectance of TiO₂single crystals. II. Assignment to electronic energy levels

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On the Theory of Electroabsorption in Polar Crystals

Cited by 3 publications

References 11 publications

Magnetopolaritons in Wurtzite‐Type Crystals

Magnetopolaritons in Wurtzite‐Type Crystals

On the Electron–Phonon and Exciton–Phonon Interaction in ZnTe

Reflectance and electroreflectance of TiO2single crystals. II. Assignment to electronic energy levels

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Product

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Reflectance and electroreflectance of TiO₂single crystals. II. Assignment to electronic energy levels