scholarly journals Optical phonon modes, static and high-frequency dielectric constants, and effective electron mass parameter in cubic In2O3

2021 ◽  
Vol 129 (22) ◽  
pp. 225102
Author(s):  
Megan Stokey ◽  
Rafał Korlacki ◽  
Sean Knight ◽  
Alexander Ruder ◽  
Matthew Hilfiker ◽  
...  
Keyword(s):  
Optical Phonon ◽  
High Frequency ◽  
Mass Parameter ◽  
Dielectric Constants ◽  
Electron Mass ◽  
Effective Electron Mass ◽  
Phonon Modes ◽  
Effective Electron

Effective electron mass and phonon modes inn-type hexagonal InN

2002 ◽  
Vol 65 (11) ◽  
Author(s):  
A. Kasic ◽  
M. Schubert ◽  
Y. Saito ◽  
Y. Nanishi ◽  
G. Wagner
Keyword(s):  
Electron Mass ◽  
Effective Electron Mass ◽  
Phonon Modes ◽  
Effective Electron

ON A SUPERLATTICE BLOCH OSCILLATOR

2004 ◽  
Vol 03 (01n02) ◽  
pp. 177-185 ◽  
Author(s):  
Y. A. ROMANOV ◽  
J. Y. ROMANOVA
Keyword(s):  
High Frequency ◽  
Electron Mass ◽  
Differential Conductivity ◽  
Effective Electron Mass ◽  
Bloch Oscillations ◽  
Semiconductor Superlattices ◽  
Effective Electron ◽  
Field Amplification ◽  
Dispersion Law

We examine the static and high-frequency differential conductivity of semiconductor superlattices having various miniband dispersion laws. Our analysis shows that the anharmonicity of Bloch oscillations leads to the occurrence of negative high-frequency differential conductivity at frequency multiples of the Bloch frequency. This effect can arise even in regions of positive static differential conductivity. To achieve terahertz field amplification, we propose to employ structures having miniband dispersion law with decreasing effective electron mass as energy increases.

Intersubband optical absorption and electron relaxation rates in GaN/AlGaN coupled double quantum wells

2001 ◽  
Vol 693 ◽  
Author(s):  
J. D. Heber ◽  
C. Gmachl ◽  
H. M. Ng ◽  
A. Y. Cho ◽  
S.-N. G. Chu
Keyword(s):  
Quantum Wells ◽  
Optical Phonon ◽  
Longitudinal Optical ◽  
Longitudinal Optical Phonon ◽  
Double Quantum ◽  
Electron Mass ◽  
Effective Electron Mass ◽  
Effective Electron ◽  
Peak Absorption ◽  
Electron Relaxation

AbstractRecent interest in intersubband (IS) transitions in semiconductor heterostructures with large band offset has been fueled by attempts to extend the wavelength range of IS-based optical devices to the fiber-optics wavelength range around ~ 1.55 μm. GaN/AlGaN-based heterostructures are of particular interest due to their large effective electron mass and large longitudinal optical phonon energy. Both are essential to achieve ultrafast electron relaxation at large transition energies. IS absorption in GaN/AlGaN single and coupled double quantum wells (DQWs) has been measured. The samples were grown by molecular beam epitaxy on sapphire substrate and with a large (0.65 or 0.9) AlN-mole fraction in the barriers. Peak absorption wavelengths as short as 1.35 μm and 1.52 μm were measured for a symmetric DQW of 12 Å wide wells coupled by a 10 Å wide barrier, which also showed evidence of excited-state anti-crossing. As expected, asymmetric DQWs displayed no such anti-crossing, and the ground-state anti-crossing energies were found to be much smaller – as a result of the comparatively large effective electron mass – than the energy broadening of individual transitions. The asymmetric DQWs displayed peak absorption wavelengths between 1.5 and 2.9 μm. The electron relaxation time, attributed to longitudinal optical phonon scattering has been measured by pump-probe technique as 240 fs for a coupled DQW sample.

scholarly journals LDA+DMFTspectral functions and effective electron mass enhancement in the superconductor LaFePO

2010 ◽  
Vol 81 (17) ◽  
Author(s):  
S. L. Skornyakov ◽  
N. A. Skorikov ◽  
A. V. Lukoyanov ◽  
A. O. Shorikov ◽  
V. I. Anisimov
Keyword(s):  
Electron Mass ◽  
Effective Electron Mass ◽  
Effective Electron ◽  
Mass Enhancement

Effective electron mass in heavily doped GaAs in the ordering of impurity complexes

2002 ◽  
Vol 36 (4) ◽  
pp. 385-389 ◽  
Author(s):  
V. A. Bogdanova ◽  
N. A. Davletkil’deev ◽  
N. A. Semikolenova ◽  
E. N. Sidorov
Keyword(s):  
Electron Mass ◽  
Effective Electron Mass ◽  
Effective Electron ◽  
Heavily Doped
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