Influence of confined optical phonons and laser radiation on the hall effect in a compositional superlattice

2018 ◽  
Vol 532 ◽  
pp. 149-154 ◽  
Author(s):  
Nguyen Quang Bau ◽  
Do Tuan Long
Keyword(s):  
Laser Radiation ◽  
Hall Effect ◽  
Optical Phonons

scholarly journals Influence of Confined Optical Phonons and Laser Radiation on the Radioelectric Effect in a Cylindrical Semiconductor Quantum Wire with Parabolic Potential

2017 ◽  
Vol 33 (3) ◽  
Author(s):  
Bau Nguyen Quang ◽  
Cao Thi Vi Ba ◽  
Do Tuan Long
Keyword(s):  
Laser Radiation ◽  
Quantum Wire ◽  
Electromagnetic Waves ◽  
Optical Phonons ◽  
Phonon Confinement ◽  
Quantum Numbers ◽  
Parabolic Potential ◽  
Linearly Polarized ◽  
Dc Electric Field ◽  
Bulk Phonon

Abstract. Based on the quantum kinetic equation method, the influence of confined optical phonons and laser radiation on the Radioelectric effect in a cylindrical semiconductor quantum wire with parabolic potential subjected to a dc electric field and a linearly polarized electromagnetic wave has been theoretically studied. The obtained analytical expression of the Radioelectric field (REF) depends on frequencies and amplitudes of the external electromagnetic waves, the quantum wire parameters, the temperature of the system, and especially the quantum numbers (n and m) which characterize the phonon confinement. Numerical calculations for the GaAs/GaAsAl quantum wire show the strongly impact of the confined optical phonons as well as the laser radiation on the REF magnitude and posture. The REF also has more resonance peaks in comparison with that in case of bulk phonon.

scholarly journals Поглощение мощного света свободными электронами в кристаллах: внутризонные электрон-фононные осцилляции Раби

2020 ◽  
Vol 128 (12) ◽  
pp. 1854
Author(s):  
Е.Ю. Перлин ◽  
А.В. Иванов ◽  
А.А. Попов
Keyword(s):  
Laser Radiation ◽  
Laser Pulse ◽  
Pulsed Laser ◽  
Longitudinal Optical ◽  
Optical Phonons ◽  
Radiation Frequency ◽  
Free Electrons ◽  
Pulsed Laser Radiation ◽  
Near Ir ◽  
Radiation Wave

Absorption of high-intensity visible or near-IR pulsed laser radiation at free electrons in crystals is calculated in the modified resonance approximation. The probabilities $W_{exc}$ of intraband transitions with a change in the electron energy by $\hbar(\omega\pm\omega_l)$, where $\omega$ is the radiation frequency and $/omega_l$ the frequency of longitudinal optical phonons involved in the process, are derived. It is shown that specific electron–phonon Rabi oscillations with the frequency $\Omega_R$ can occur and radiation is absorbed only until the point in time $\tau_1$, at which the first maximum in the dependence $W_{exc} (t)$, where t is the time elapsed from the beginning of the laser pulse, is reached. It is shown that, in the case of prebreakdown radiation intensities, the processes of high orders in field of the radiation wave substantially influence $W_{exc}$, $\tau_1$, and $\Omega_R$.

Inelastic scattering at surfaces and interfaces

1986 ◽  
Vol 44 ◽  
pp. 392-393
Author(s):  
R. H. Ritchie ◽  
A. Howie
Keyword(s):  
Inelastic Scattering ◽  
Surface Properties ◽  
Correlation Energy ◽  
Condensed Matter ◽  
Charged Particles ◽  
Condensed Matter Physics ◽  
Optical Phonons ◽  
Exchange Correlation ◽  
Surfaces And Interfaces ◽  
Inelastic Interactions

An important part of condensed matter physics in recent years has involved detailed study of inelastic interactions between swift electrons and condensed matter surfaces. Here we will review some aspects of such interactions.Surface excitations have long been recognized as dominant in determining the exchange-correlation energy of charged particles outside the surface. Properties of surface and bulk polaritons, plasmons and optical phonons in plane-bounded and spherical systems will be discussed from the viewpoint of semiclassical and quantal dielectric theory. Plasmons at interfaces between dissimilar dielectrics and in superlattice configurations will also be considered.

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