Dielectric properties and long-wavelength optical modes of the high-κoxideLaAlO3

2005 ◽  
Vol 71 (13) ◽  
Author(s):  
Pietro Delugas ◽  
Vincenzo Fiorentini ◽  
Alessio Filippetti
Keyword(s):  
Dielectric Properties ◽  
Long Wavelength ◽  
Optical Modes

Long-wavelength lattice vibrations of Ag3In5Se9 and Ag3In5Te9 single crystals — An inversion of LO- and TO-mode frequencies

2016 ◽  
Vol 30 (18) ◽  
pp. 1650229 ◽  
Author(s):  
Nizami Mamed Gasanly
Keyword(s):  
Refractive Index ◽  
Single Crystals ◽  
Longitudinal Optical ◽  
Absorption Index ◽  
Energy Losses ◽  
Optical Parameters ◽  
Lattice Vibrations ◽  
Frequency Range ◽  
Long Wavelength ◽  
Optical Modes

Infrared (IR) reflectivities are registered in the frequency range of 50–2000 cm[Formula: see text] for Ag3In5Se9 and Ag3In5Te9 single crystals grown by Bridgman method. Three infrared-active modes are detected in spectra. The optical parameters, real and imaginary parts of the dielectric function, the function of energy losses, refractive index, absorption index and absorption coefficient were calculated from reflectivity experiments. The frequencies of transverse and longitudinal optical modes (TO and LO modes) and oscillator strength were also determined. The bands detected in infrared spectra were tentatively attributed to various vibration types (valence and valence-deformation). The inversion of LO- and TO-mode frequencies of the sandwiched pair was observed for studied crystals.

Analysis of the phenomenological models for long-wavelength polar optical modes in semiconductor layered systems

1992 ◽  
Vol 45 (20) ◽  
pp. 11944-11948 ◽  
Author(s):  
C. Trallero-Giner ◽  
F. García-Moliner ◽  
V. R. Velasco ◽  
M. Cardona
Keyword(s):  
Phenomenological Models ◽  
Layered Systems ◽  
Long Wavelength ◽  
Optical Modes

scholarly journals Phenomenological model for long-wavelength optical modes in transition metal dichalcogenide monolayer

2021 ◽  
Vol 103 (23) ◽  
Author(s):  
C. Trallero-Giner ◽  
E. Menéndez-Proupin ◽  
E. Suárez Morell ◽  
R. Pérez-Álvarez ◽  
Darío G. Santiago-Pérez
Keyword(s):  
Transition Metal ◽  
Phenomenological Model ◽  
Transition Metal Dichalcogenide ◽  
Long Wavelength ◽  
Optical Modes

Optical modes and dielectric properties of ferroelectric orthorhombicKNbO3

1976 ◽  
Vol 13 (7) ◽  
pp. 3109-3120 ◽  
Author(s):  
D. G. Bozinis ◽  
J. P. Hurrell
Keyword(s):  
Dielectric Properties ◽  
Optical Modes

Long-wavelength polar optical modes in GaAs semiconductor layered structures

1993 ◽  
Vol 5 (31) ◽  
pp. 5389-5400 ◽  
Author(s):  
R Perez-Alvarez ◽  
F Garcia-Moliner ◽  
V R Velasco ◽  
C Trallero-Giner
Keyword(s):  
Layered Structures ◽  
Long Wavelength ◽  
Optical Modes

ON THE LINEAR DIELECTRIC PROPERTIES OF FINITE IONIC CRYSTALS

1965 ◽  
Vol 43 (9) ◽  
pp. 1604-1615 ◽  
Author(s):  
J. Grindlay
Keyword(s):  
Dielectric Properties ◽  
Ionic Crystal ◽  
Dielectric Constants ◽  
Ionic Crystals ◽  
Long Wavelength ◽  
Infinite Crystal ◽  
Basic Equations

The basic equations for determining the linear dielectric constants of a finite ionic crystal with arbitrary basis are derived and shown to be equivalent to those obtained by Born and Huang for an infinite crystal. The derivation is based on the assumption that the relaxation of the interionic spacing at the surface of the crystal merely extends over a few layers of ions. The approach used in these calculations is extended to the description of certain long-wavelength oscillations with shape-dependent frequencies.

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