Dielectric functions and interband critical points of anisotropic chain structured TlSe single crystals

Date

2012-10-15

Author

IŞIK, MEHMET
Hasanlı, Nızamı

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

171
views

0
downloads

Spectroscopic ellipsometry measurements were carried out on TlSe single crystals for orientations of electric field, parallel (E parallel to c), and perpendicular (E perpendicular to c) to optic axis c. The experiments were performed in the 1.2-6.2 eV spectral range at room temperature. The real and imaginary parts of the pseudodielectric function as well as pseudorefractive index and pseudoextinction coefficient were calculated from the analysis of ellipsometric data under the light of ambient-substrate optical model. The energies of interband transitions (critical points) have been found from the analysis on second derivative spectra of the pseudodielectric function. The analysis revealed four and five interband transition structures for E parallel to c and E perpendicular to c configurations, respectively. The obtained critical point energies were assigned tentatively to interband transitions using the available electronic energy band structure given in literature. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4761963]

Subject Keywords

Absorption-Edge, Gap, Conductivity, Ellipsometry

URI

https://hdl.handle.net/11511/37101

Journal

JOURNAL OF APPLIED PHYSICS

DOI

https://doi.org/10.1063/1.4761963

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

Optical constants and interband transitions of anisotropic layered structured Tl2GaInS4 crystals by spectroscopic ellipsometry IŞIK, MEHMET; Hasanlı, Nızamı; Turan, Raşit (2013-02-05) Spectroscopic ellipsometry measurements were carried out on Tl2GaInS4 layered crystals for orientations of electric field vector, parallel (E//c*) and perpendicular (E perpendicular to c*) to optical axis c*. The measurements were performed in the 1.2-6.2 eV spectral range at room temperature. The real and imaginary components of the pseudodielectric function, pseudorefractive index and pseudoextinction coefficient were calculated from the analysis of ellipsometric data. The energies of interband transition...
Spectroscopic ellipsometry study of above-band gap optical constants of layered structured TlGaSe2, TlGaS2 and TlInS2 single crystals IŞIK, MEHMET; Hasanlı, Nızamı; Turan, Raşit (2012-11-01) Spectroscopic ellipsometry measurements on TlGaSe2, TlGaS2 and TlInS2 layered crystals were carried out on the layer-plane (0 0 1) surfaces, which are perpendicular to the optic axis c*, in the 1.2- 6.2 eV spectral range at room temperature. The real and imaginary parts of the pseudodielectric function as well as pseudorefractive index and pseudoextinction coefficient were found as a result of analysis of ellipsometric data. The structures of critical points in the above-band gap energy range have been char...
Optical parameters of anisotropic chain-structured Tl2InGaTe4 crystals by spectroscopic ellipsometry IŞIK, MEHMET; Hasanlı, Nızamı (Elsevier BV, 2016-01-01) Spectroscopic ellipsometry measurements were performed on Tl2InGaTe4 single crystals in the 1.2-6.2 eV range for orientations of electric field, parallel (E//c) and perpendicular (E perpendicular to c) to optic axis c. Spectral dependence of optical parameters; real and imaginary components of the dielectric function, refractive index and extinction coefficient were obtained from the analyses of experimental data using an ambient-substrate optical model. The analysis of the absorption data calculated using ...
Numerical Solution and Stability Analysis of Transient MHD Duct Flow Tezer, Münevver (2018-11-01) This paper simulates the 2D transient magnetohydrodynamic (MHD) flow in a rectangular duct in terms of the velocity of the fluid and the induced magnetic field by using the radial basis function (RBF) approximation. The inhomogeneities in the Poisson’s type MHD equations are approximated using the polynomial functions (1+r) and the particular solution is found satisfying both the equations and the boundary conditions (no-slip and insulated walls). The Euler scheme is used for advancing the solution to ste...
Band gap and refractive index tunability in thallium based layered mixed crystals Hasanlı, Nızamı (2015-07-21) Compositional variation of the band gap energy and refractive index of TlMeX2-type (Me = Ga or In and X = S or Se) layered mixed crystals have been studied by the transmission and reflection measurements in the wavelength range of 400-1100 nm. The analysis of absorption data of TlGa1-xInxSe2, TlGa(S1-xSex)(2), TlGa1-xInxS2, and TlIn(Se1-xSx)(2) mixed crystals revealed the presence of both optical indirect and direct transitions. It was found that the energy band gaps of mixed crystals decrease at the replac...

Citation Formats

M. IŞIK and N. Hasanlı, “Dielectric functions and interband critical points of anisotropic chain structured TlSe single crystals,” JOURNAL OF APPLIED PHYSICS, pp. 0–0, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/37101.