Magnetooptical Absorption of a Molecular Crystal in the Exciton Frequency Range

Derevyanchuk, A. V.; Zenkova, K. Yu.; Kramar, V. M.; Nitsovich, Bohdan M.

doi:10.1134/1.1946858

Cited by 2 publications

(2 citation statements)

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“…Theoretical investigations of the manifestation of optical bistability in the region of excitation of Wannier-Mott and Frenkel excitons, carried out more than 15 years ago under the guidance of Nitsovich, nearly exhausted the problems related to manifestation of optical [9], temperature [10], polarization [11], and magnetooptical [12,13] bistabilities in isotropic crystals. It was established that the dynamic nonlinearity of optical absorption, which is favorable for implementing optical bistability at high laser intensities, is explained by the competition of the processes of excitation of exciton states and their relaxation due to the exciton-phonon interaction [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…It was established that the dynamic nonlinearity of optical absorption, which is favorable for implementing optical bistability at high laser intensities, is explained by the competition of the processes of excitation of exciton states and their relaxation due to the exciton-phonon interaction [13,14]. It was also noted that manifestation of optical bistability in layered crystals may have a specific feature, i.e., occurrence of indirect vertical phototransitions responsible for the formation of multistable states [11,15].…”

Section: Introductionmentioning

confidence: 99%

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10.1007/s11449-008-2011-z

2010

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The effect of weak external magnetic fields on the conditions for implementing optical bistability in the region of exciton absorption of layered semiconductors has been theoretically investigated. By the example of the 2 H polytype of lead diiodide, it is shown that, changing the strength of an external magnetic field, one can form conditions for implementing bistability and effectively control the position and sizes of the hysteresis loop of exciton absorption.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

10.1007/s11449-008-2011-z

2010

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Mathematical Modeling of Temperature Effect on the Fan Chart of Magnetoabsorption Spectrum in Semiconductors

Gulyamov

Эркабоев

Gulyamov

2019

Alʹternativnaâ ènergetika i èkologiâ

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The article considers the oscillations of interband magneto-optical absorption in semiconductors with the Kane dispersion law. We have compared the changes in oscillations of the joint density of states with respect to the photon energy for different Landau levels in parabolic and non-parabolic zones. An analytical expression is obtained for the oscillation of the combined density of states in narrow-gap semiconductors. We have calculated the dependence of the maximum photon energy on the magnetic field at different temperatures. A theoretical study of the band structure showed that the magnetoabsorption oscillations decrease with an increase in temperature, and the photon energies nonlinearly depend on a strong magnetic field. The article proposes a simple method for calculating the oscillation of joint density of states in a quantizing magnetic field with the non-quadratic dispersion law. The temperature dependence of the oscillations joint density of states in semiconductors with non-parabolic dispersion law is obtained. Moreover, the article studies the temperature dependence of the band gap in a strong magnetic field with the non-quadratic dispersion law. The method is applied to the research of the magnetic absorption in narrow-gap semiconductors with nonparabolic dispersion law. It is shown that as the temperature increases, Landau levels are washed away due to thermal broadening and density of states turns into a density of states without a magnetic field. Using the mathematical model, the temperature dependence of the density distribution of energy states in strong magnetic fields is considered. It is shown that the continuous spectrum of the density of states, measured at the temperature of liquid nitrogen, at low temperatures turns into discrete Landau levels. Mathematical modeling of processes using experimental values of the continuous spectrum of the density of states makes it possible to calculate discrete Landau levels. We have created the three-dimensional fan chart of magneto optical oscillations of semiconductors with considering for the joint density of energy states. For a nonquadratic dispersion law, the maximum frequency of the absorbed light and the width of the forbidden band are shown to depend nonlinearly on the magnetic field. Modeling the temperature dependence allowed us to determine the Landau levels in semiconductors in a wide temperature spectrum. Using the proposed model, the experimental results obtained for narrow-gap semiconductors are analyzed. The theoretical results are compared with experimental results.

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Magnetooptical Absorption of a Molecular Crystal in the Exciton Frequency Range

Cited by 2 publications

References 2 publications

10.1007/s11449-008-2011-z

10.1007/s11449-008-2011-z

Mathematical Modeling of Temperature Effect on the Fan Chart of Magnetoabsorption Spectrum in Semiconductors

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