Optical Response of Semiconductors in Electric Fields: Excitonic Effects

Weinstein, Frank C.; Dow, John D.; Lao, Binneg Y.

doi:10.1103/physrevb.4.3502

Cited by 45 publications

(12 citation statements)

References 25 publications

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“…However, in the region below the band-gap energy, the calculated line shape exhibits deviations from the measured spectrum. Our model does not include excitonic effects 31) and impurity effects. 4,32,33) Weinstein et al 31) reported that excitonic effects enhance the intensity of electroreflectance near the bandedge energy.…”

Section: Comparison Of Calculated Spectra With Measured Spectramentioning

confidence: 99%

“…Our model does not include excitonic effects 31) and impurity effects. 4,32,33) Weinstein et al 31) reported that excitonic effects enhance the intensity of electroreflectance near the bandedge energy. This seems to be the reason for the deviation in the amplitude of the calculated line shape in the energy region 1.40 to 1.42 eV.…”

Section: Comparison Of Calculated Spectra With Measured Spectramentioning

confidence: 99%

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Interference Effect on the Phase of Franz–Keldysh Oscillations in GaAs/AlGaAs Heterostructures

Takeuchi

Yamamoto

Hattori

et al. 2003

Jpn. J. Appl. Phys.

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We have studied photoreflectance spectra of GaAs/Al 0:3 Ga 0:7 As heterostructures from the viewpoint of the phase of Franz-Keldysh (FK) oscillations. The phase of the FK oscillations originating from the GaAs buffer layer shifts with the change of the Al 0:3 Ga 0:7 As-layer thickness, while the period does not vary. The FK-oscillation phase does not depend on the pump power, which suggests that the phase shift is not caused by a difference in the magnitude of modulation. We propose a calculation model for FK oscillations that includes the interference of probe light. Photoreflectance spectra calculated on the basis of this model are compared with the measured spectra. We conclude that mixing of the real and imaginary parts of a modulated dielectric function, which is caused by the probe-light interference, gives rise to the phase shift of the FK oscillations. We also derive a novel analysis method for a linear plot of the extremum positions of FK oscillations based on the above line-shape model. The present method remarkably reduces ambiguity in the estimation of band-gap energy that is considerable in a conventional analysis.

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Section: Comparison Of Calculated Spectra With Measured Spectramentioning

confidence: 99%

Section: Comparison Of Calculated Spectra With Measured Spectramentioning

confidence: 99%

Interference Effect on the Phase of Franz–Keldysh Oscillations in GaAs/AlGaAs Heterostructures

Takeuchi

Yamamoto

Hattori

et al. 2003

Jpn. J. Appl. Phys.

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“…The higher estimates of the exciton Rydberg for PbI, fail to account for the fact that a t rooni temperature the exciton appears only as a faint shoulder. For R = 100 meV, I'IB a t room temperature is about 0.25 and the exciton should show up as a definite line [14], but for R = 16 meV then r / R e 1.6 which, for a theoretically broadened exciton line would yield the type of shoulder measured experimentally. From EA experiments [6] it seemed that the idea of a double series was a valid one.…”

Section: Experimental Results and Interpretationmentioning

confidence: 94%

Electric field effects on anisotropic excitons in lead iodide

Bordas

Riccò

1975

Physica Status Solidi (b)

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The electric field dependence of the ground state of the exciton a t the fundamental absorption edge of PbI, is interpreted by means of a theoretical approach including anisotropy. As a result of the theoretical fit to the experimental curt-es the following exciton parameters are obtained: R = 16 meV, E L = 36, E I I = 24, a~ = 20 A, all = 13 A. These estimates are used to explain satisfactorily the behaviour of the electroabsorption spectrum as well as the temperature dependence of the width of the exciton line which previous published values failed to do.Dam une approximation thhorique qui inclut I'anisotropie, on a interpret6 la variation en fonction du champ 6lectrique de l'6tat fondamental de l'exciton associi! h I'ar@te d'absorption optique de PbI,. Aprks ajustage aux courbes expkrimentales on a obtenu les parametres excitoniques suivants: R = 16 meV, E L =-36, ell = 24, "1 = 20 A, all = 13 A. Ces estimations permettent d'expliquer de faGon satisfaisante le spectre d'6lectroabsorption et lae variation avec la temperature de la largeur de ligne de l'exciton, ce que n'6tait pas possible au moyen des valeurs pabli6es preckdemment.

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“…In the equation, the term can be regarded as a generalized phase factor of the FKOs. We note that the phase of FKOs is also influenced in general by excitonic 47 and surface-termination 48 effects. In addition, the phase depends on the modulation magnitude.…”

Section: Application To the Evaluation Of The Cat-cvd Of Sin Xmentioning

confidence: 88%