scholarly journals Modelling of Hot Acoustic Phonon Propagation in Two Dimensional Layers

VLSI Design ◽  
1998 ◽  
Vol 6 (1-4) ◽  
pp. 197-200
Author(s):  
N. A. Bannov ◽  
V. V. Mitin ◽  
F. T. Vasko
Keyword(s):  
Kinetic Equation ◽  
Quantum Well ◽  
Decay Rate ◽  
Acoustic Phonon ◽  
Deformation Potential ◽  
Two Dimensional ◽  
Quantum Kinetic Equation ◽  
Acoustic Phonons ◽  
Phonon Interaction

The transport of confined acoustic phonons in a flee-standing quantum well has been studied by solving the quantum kinetic equation for phonons. The phonon decay rate has been numerically calculated for GaAs flee-standing quantum well. Phonon interaction with electrons through the deformation potential makes the major contribution to the acoustic phonon decay.

DEPENDENCE OF EXCITON FORMATION ON ITS CENTER-OF-MASS MOMENTUM IN QUANTUM WELLS

2001 ◽  
Vol 15 (28n30) ◽  
pp. 3660-3663 ◽  
Author(s):  
I.-K. OH ◽  
JAI SINGH
Keyword(s):  
Quantum Wells ◽  
Optical Phonon ◽  
Acoustic Phonon ◽  
Center Of Mass ◽  
Longitudinal Optical ◽  
Longitudinal Optical Phonon ◽  
Deformation Potential ◽  
Phonon Interaction ◽  
Carrier Temperature ◽  
Comprehensive Study

We present a comprehensive study of the process of exciton formation due to exciton-phonon interaction. Using the exciton-phonon interaction arising from deformation potential, piezoelectric, and polar couplings, we have calculated the rate of formation of an exciton as a function of carrier densitiies, temperatures, and center-of-mass momentum ( K ‖) in quantum wells. Our results show that excitons are dominantly formed at non-zero K ‖, which agrees very well with experiments. The formation of an exciton due to emission of longitudinal optical phonon is found to be more efficient at relatively small values of K ‖, and that due to acoustic phonon emission is more efficient at relatively large K ‖ values for carrier temperature Te-h≲50 K.

scholarly journals The Calculation of the Ettingshausen Coefficient in Quantum Wells under the Influence of Confined Phonons (for Electron – confined Optical Phonon Scattering)

2019 ◽  
Vol 35 (2) ◽  
Author(s):  
Nguyen Thi Lam Quynh ◽  
Cao Thi Vi Ba ◽  
Nguyen Quang Bau
Keyword(s):  
Magnetic Field ◽  
Kinetic Equation ◽  
Quantum Well ◽  
Quantum Wells ◽  
Quantum Number ◽  
Optical Phonon ◽  
Phonon Scattering ◽  
Resonance Condition ◽  
Constant Electric Field ◽  
Quantum Kinetic Equation

Abstract: In this paper, we have used the method of quantum kinetic equation to calculate the analytic expression for Ettingshausen coefficient (EC) under the influence of confined phonon. We considered a quantum well in the presence of constant electric field, magnetic field and electromagnetic wave (EMW) with assumption that electron – confined optical phonon (OP) scattering is essential. The EC obtained depends on many quantities in a complicated way such as temperature, magnetic field, frequency or amplitude of EMW and m - quantum number which specify confined OP. Numerical results for GaAs/GaAsAl quantum well (QW) have displayed clearly the differences in comparison with both cases of bulk semiconductor and unconfined phonon. The result of examining the EC’s dependence on magnetic field shows that quantum number m changes resonance condition; m not only makes the increase in the number of resonance peak but also changes the position of peaks. When m is set to zero, we get the results that corresponds to unconfined OP. Keywords: Quantum well, Ettingshausen effect, Quantum kinetic equation, confined optical phonons.

Exciton–phonon interaction in quasi-two dimensional layered (PEA)2(CsPbBr3)n−1PbBr4 perovskite

Nanoscale ◽  
2019 ◽  
Vol 11 (45) ◽  
pp. 21867-21871 ◽  
Author(s):  
Hao Long ◽  
Xiang Peng ◽  
Jianxun Lu ◽  
Kebin Lin ◽  
Liqiang Xie ◽  
...  
Keyword(s):  
Optical Phonon ◽  
Coupling Strength ◽  
Acoustic Phonon ◽  
Longitudinal Optical ◽  
Longitudinal Optical Phonon ◽  
Two Dimensional ◽  
Phonon Coupling ◽  
Phonon Interaction ◽  
2D Material ◽  
Exciton Coupling

Exciton–phonon interaction in quasi-2D material was investigated. It was shown that longitudinal optical phonon, rather than acoustic phonon-exciton coupling dominated the enhancement of exciton–phonon coupling strength.

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