THE REFLECTIVITY OF THE MIXED CRYSTAL AB1-xCx

2010 ◽  
Vol 24 (27) ◽  
pp. 5337-5343
Author(s):  
XIAOYAN ZHANG ◽  
JINGFENG WANG ◽  
GUOLIANG FAN
Keyword(s):  
Mixed Crystal ◽  
Random Element ◽  
Mixed Crystals ◽  
Phonon Interaction ◽  
Long Wavelength ◽  
Electron Phonon Interaction ◽  
The Third ◽  
Optical Character ◽  
Mode Behavior ◽  
The One

The properties of long wavelength optical phonons in mixed crystals AB 1-x C x is discussed by a model similar to Modified Random Element Isodisplacement (MREI). Using this method we investigate the frequencies, the dielectric functions, and the reflectivity of several mixed crystals. It is found that this model can be applied to the one-mode behavior, the two-mode behavior, and that of the third category. So the model provides a possible way to understand the optical character of the ternary mixed crystal. Based on it, we can discuss other problems similar to electron–phonon interaction and so on.

Electron–phonon interaction in quasi-1D ternary mixed crystals of polar semiconductors

2015 ◽  
Vol 29 (23) ◽  
pp. 1550130 ◽  
Author(s):  
Yunpeng Fan ◽  
Junhua Hou
Keyword(s):  
Cell Volume ◽  
Unit Cell Volume ◽  
Mixed Crystal ◽  
Random Element ◽  
Unit Cell ◽  
Mixed Crystals ◽  
Phonon Modes ◽  
Phonon Interaction ◽  
One Dimensional ◽  
Electron Phonon Interaction

The electron–optical-phonon interaction between an electron and two branches of LO-phonon modes in a quasi-one-dimensional ternary mixed crystal (TMC) of polar semiconductors is studied. The new electron–phonon interaction Hamiltonian including the unit-cell volume variation in TMCs is obtained by using the modified random element isodisplacement model and Born–Huang method. The energies of polaron are numerically calculated for several systems of III–V compounds. A group of III-nitride mixed crystals is also taken into numerical calculation in our theory. It is verified theoretically that the obvious nonlinearity of the polaronic energy and effective mass with the composition is essential and the unit-cell volume effects cannot be neglected except the very weak e–p coupling.

ELECTRON–PHONON INTERACTION IN WURTZITE AlxGa1-xN TERNARY CRYSTAL

2007 ◽  
Vol 21 (22) ◽  
pp. 3841-3850 ◽  
Author(s):  
SHU YI WEI ◽  
FANG ZHANG ◽  
WEI LI ◽  
ZU ZHAO ◽  
WEN DENG HUANG
Keyword(s):  
Unit Cell Volume ◽  
Unit Cell ◽  
Coupling Constants ◽  
Phonon Interaction ◽  
Electron Phonon Interaction ◽  
Effective Masses ◽  
Mode Behavior ◽  
Polaron Energy ◽  
The One ◽  
Ternary Nitride

Optical vibrations of the lattice and the electron-optical-phonon interaction in wurtzite ternary nitride-based crystals was studied using the pseudo-unit-cell approach. The Fröhlich coupling constants, polaron energy shifts and the effective masses of the polaron in the system were investigated using the perturbation method. It was found that the LO and TO phonons in wurtzite Al x Ga 1-x N exhibit the one-mode behavior. The effects of the unit-cell volume varying with the composition x of ternary nitride-based crystals were also investigated.

Effects of ternary mixed crystals on interface/surface optical phonon in spherical core-shell quantum dots

2019 ◽  
Vol 33 (06) ◽  
pp. 1950068
Author(s):  
Y. Liu ◽  
L. P. Liu ◽  
Y. Xing ◽  
X. X. Liang
Keyword(s):  
Mixed Crystals ◽  
Core Shell ◽  
Phonon Modes ◽  
Electron Phonon Interaction ◽  
Interface Surface ◽  
Photoelectric Properties ◽  
Surface Optical ◽  
Spherical Core ◽  
The One ◽  
Dielectric Continuum

Within the framework of the dielectric continuum approach and modified random-element-isodisplacement model, the optical vibration mode in a spherical core-shell quantum dot (CSQD) consisting of ternary mixed crystals (TMCs) are investigated. The dispersion relation and electron–phonon interaction Hamiltonian are derived. As a typical case, the numerical results for [Formula: see text] and [Formula: see text] CSQDs are obtained and discussed. Taking the one- and two-mode behaviors of TMCs into account, the effects of TMCs on interface/surface optical (IO/SO) phonon show that there are 3 and 5 branches of IO/SO phonon modes in [Formula: see text] and [Formula: see text] CSQDs for a given component of TMC, respectively. It is also found that the IO/SO phonon frequencies and electron–phonon interactions are strongly dependent on the component of TMCs and the size of CSQDs. We hope this work would be useful for the study of the phonon-related photoelectric properties in CSQDs consisting of TMCs.

ELECTRONIC THEORY FOR ELECTRON-DOPED CUPRATE SUPERCONDUCTORS: d-WAVE SUPERCONDUCTIVITY AND THE PHASE DIAGRAM

2000 ◽  
Vol 14 (29n31) ◽  
pp. 3555-3560
Author(s):  
D. MANSKE ◽  
I. EREMIN ◽  
K. H. BENNEMANN
Keyword(s):  
Cuprate Superconductors ◽  
Narrow Range ◽  
Spin Fluctuation ◽  
Flat Band ◽  
Superconducting Transition ◽  
Phonon Interaction ◽  
Pairing Mechanism ◽  
Lattice Disorder ◽  
Electron Phonon Interaction ◽  
The One

Using the one-band Hubbard Hamiltonian we determine various basic properties of the electron-doped cuprate superconductor Nd 2-x Ce x CuO 4 for a spin-fluctuation-induced pairing mechanism. We find a narrow range of superconductivity and, most importantly, like for hole-doped cuprates dx2-y2 -symmetry for the superconducting order parameter. The superconducting transition temperatures Tc(x) for various electron doping concentrations x are calculated to be much smaller than for hole-doped cuprates due to the different energy dispersion and a flat band well below the Fermi level. We find that lattice disorder may sensitively distort the dx2-y2 -symmetry via electron-phonon interaction yielding a finite isotope exponent α0.

Electron–phonon interaction in three-, two- and one-dimensional ternary mixed crystals

2016 ◽  
Vol 30 (15) ◽  
pp. 1650182
Author(s):  
Junhua Hou ◽  
Yunpeng Fan
Keyword(s):  
Cell Volume ◽  
Effective Mass ◽  
Unit Cell Volume ◽  
Three Dimensional ◽  
Unit Cell ◽  
Mixed Crystals ◽  
Phonon Interaction ◽  
One Dimensional ◽  
Electron Phonon Interaction ◽  
Self Trapping

The electron–phonon (e–p) interaction in three-dimensional (3D), two-dimensional (2D) and one-dimensional (1D) ternary mixed crystals is studied. The e–p interaction Hamiltonians including the unit cell volume variation in ternary mixed crystals are obtained by using the modified random-element-isodisplacement model and Born–Huang method. The polaronic self-trapping energy and renormalized effective mass of GaAs[Formula: see text]Sb[Formula: see text], GaP[Formula: see text]As[Formula: see text] and GaP[Formula: see text]Sb[Formula: see text] compounds are numerically calculated. It is confirmed theoretically that the nonlinear variation of the self-trapping energy and effective mass with the composition is essential and the unit cell volume effects cannot be neglected except the weak e–p coupling. The dimensional effect cannot also be ignored.

ELECTRON–PHONON INTERACTION EFFECTS ON THIRD-HARMONIC GENERATION IN CYLINDRICAL QUANTUM WIRES

2004 ◽  
Vol 18 (01) ◽  
pp. 53-61 ◽  
Author(s):  
YOU-BIN YU ◽  
KANG-XIAN GUO
Keyword(s):  
Iterative Method ◽  
Harmonic Generation ◽  
Quantum Wires ◽  
Third Harmonic Generation ◽  
Matrix Approach ◽  
Phonon Interaction ◽  
Third Harmonic ◽  
Electron Phonon Interaction ◽  
The Third ◽  
Compact Density

The influence of electron–phonon interaction on third-harmonic generation in cylindrical quantum wires are investigated. The third-harmonic generation coefficient is obtained using compact-density-matrix approach and iterative method, and the numerical results are presented for GaAs cylindrical quantum wires. The results show that the third-harmonic generation coefficient is greatly enhanced after taking into consideration the influence of electron–phonon interaction. It is about thirty times larger than that obtained by just considering electron states when electron–phonon resonance is met.

Nuclear-acoustic-resonance investigations of the long-wavelength electron-phonon interaction in vanadium

1983 ◽  
Vol 99 (5) ◽  
pp. 249-252 ◽  
Author(s):  
V. Müller ◽  
E.-J. Unterhorst ◽  
W. Neumann ◽  
G. Schanz ◽  
C. Schubert
Keyword(s):  
Acoustic Resonance ◽  
Phonon Interaction ◽  
Long Wavelength ◽  
Electron Phonon Interaction ◽  
Nuclear Acoustic Resonance

Hot Electrons Relaxation

1990 ◽  
Vol 209 ◽  
Author(s):  
A.M. Mazzone
Keyword(s):  
Simulation Method ◽  
High Energy ◽  
Hot Electrons ◽  
Direct Simulation ◽  
Thermal Spike ◽  
Phonon Interaction ◽  
Lattice Disorder ◽  
Electron Phonon Interaction ◽  
Quantum Mechanical Representation ◽  
The One

ABSTRACTThis work represents the first attempt of a direct simulation of the processes of electron-phonon interaction and lattice excitation which follow the formation of an excited electron gas such as, for instance, is the one produced by high-energy implants. The simulation method is of the type molecular dynamics and is based on a quantum mechanical representation. The results suggest a lattice disorder similar to the one of a thermal spike.

Sign in / Sign up

Export Citation Format

Share Document