Photonics / Fotonik
Recent Submissions
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Raman fingerprint of stacking order in HfS2-Ca(OH)(2) heterobilayer
(American Physical Society, 2019-05)Using density functional theory-based first-principles calculations, we investigate the stacking order dependence of the electronic and vibrational properties of HfS2-Ca(OH)(2) heterobilayer structures. It is shown that ... -
Gd3+-Doped alpha-CsPbI3 nanocrystals with better phase stability and optical properties
(American Chemical Society, 2019-10)Black alpha-CsPbI3 perovskites are unable to maintain their phase stability under room conditions; hence, the alpha-CsPbI3 phase transforms into a thermodynamically stable yellow delta-CsPbI3 phase within a few days, which ... -
Graphene-based adaptive thermal camouflage
(American Chemical Society, 2018-07)In nature, adaptive coloration has been effectively utilized for concealment and signaling. Various biological mechanisms have evolved to tune the reflectivity for visible and ultraviolet light. These examples inspire many ... -
Graphene-quantum dot hybrid optoelectronics at visible wavelengths
(American Chemical Society, 2018-06)With exceptional electronic and gate-tunable optical properties, graphene provides new possibilities for active nanophotonic devices. Requirements of very large carrier density modulation, however, limit the operation of ... -
Electrically switchable metadevices via graphene
(American Association for the Advancement of Science, 2018-01)Metamaterials bring subwavelength resonating structures together to overcome the limitations of conventional materials. The realization of active metadevices has been an outstanding challenge that requires electrically ... -
Structural, electronic and phononic properties of PtSe2: From monolayer to bulk
(Institute of Physics Publishing, 2018-06)The layer dependent structural, electronic and vibrational properties of the 1T phase of two dimensional (2D) platinum diselenide are investigated by means of state-of-the-art first-principles calculations. The main findings ... -
Theoretical and experimental investigation of conjugation of 1,6-hexanedithiol on MoS2
(Institute of Physics Publishing, 2018-03)We report an experimental and theoretical investigation of conjugation of 1,6-Hexaneditihiol (HDT) on MoS2 which is prepared by mixing MoS2 structure and HDT molecules in proper solvent. Raman spectra and the calculated ... -
Polarized emission from CsPbBr3 nanowire embedded-electrospun PU fibers
(Institute of Physics Publishing, 2018-02)Interest in all-inorganic halide perovskites has been increasing dramatically due to their high quantum yield, band gap tunability, and ease of fabrication in compositional and geometric diversity. In this study, we ... -
White LED light production using dibromoperylene derivatives in down conversion of energy
(Canadian Science Publishing, 2018)Perylene derivatives of N,N′-bis(2,6-diisopropylphenyl)-1,6(7)-dibromoperylene-3,4,9,10-tetracarboxylic diimide (DBrPDI) and 1,7-dibromo perylene-3,4,9,10-tetracarboxylic acid butyl ester (DBrPTE) were synthesized, and ... -
Hydrogen-induced sp2-sp3 rehybridization in epitaxial silicene
(American Physical Society, 2017-12)We report on the hydrogenation of (3×3)/(4×4) silicene epitaxially grown on Ag(111) studied by in situ Raman spectroscopy and state-of-the-art ab initio calculations. Our results demonstrate that hydrogenation of (3×3)/(4×4) ... -
Hydrogenation-driven phase transition in single-layer TiSe2
(IOP Publishing, 2017-11)First-principles calculations based on density-functional theory are used to investigate the effects of hydrogenation on the structural, vibrational, thermal and electronic properties of the charge density wave (CDW) phase ... -
Stable ultra-thin CdTe crystal: A robust direct gap semiconductor
(IOP Publishing, 2017-11)Employing density functional theory based calculations, we investigate structural, vibrational and strain-dependent electronic properties of an ultra-thin CdTe crystal structure that can be derived from its bulk counterpart. ... -
Thinning CsPb2Br5 perovskite down to monolayers: Cs-dependent stability
(American Physical Society, 2017-10)Using first-principles density functional theory calculations, we systematically investigate the structural, electronic, and vibrational properties of bulk and potential single-layer structures of perovskitelike CsPb2Br5 ... -
Few-layer MoS2 as nitrogen protective barrier
(IOP Publishing, 2017-09)We report experimental and theoretical investigations of the observed barrier behavior of few-layer MoS2 against nitrogenation. Owing to its low-strength shearing, low friction coefficient, and high lubricity, MoS2 exhibits ... -
Hydrogen-induced structural transition in single layer ReS2
(IOP Publishing, 2017-09)By performing density functional theory-based calculations, we investigate how structural, electronic and mechanical properties of single layer ReS2 can be tuned upon hydrogenation of its surfaces. It is found that a stable, ... -
Stability, electronic and phononic properties of β and 1T structures of SiTex (x = 1, 2) and their vertical heterostructures
(IOP Publishing, 2017-08)By performing first-principles calculations, we predict a novel, stable single layer phase of silicon ditelluride, 1T-SiTe2, and its possible vertical heterostructures with single layer β-SiTe. Structural optimization and ... -
α-Silicene as oxidation-resistant ultra-thin coating material
(Beilstein-Institut Zur Forderung der Chemischen Wissenschaften, 2017)By performing density functional theory (DFT)-based calculations, the performance of a-silicene as oxidation-resistant coating on Ag(111) surface is investigated. First of all, it is shown that the Ag(111) surface is quite ... -
Stable monolayer α-phase of CdTe: Strain-dependent properties
(Royal Society of Chemistry, 2017)CdTe is a well known and widely used binary compound for optoelectronic applications. In this study, we propose the thinnest, free standing monolayer of CdTe which has a tetragonal-PbO (α-PbO) symmetry. The structural, ... -
Strain engineering of 2D materials
(Springer, 2017-11)When bulk structures are thinned down to their monolayers, degree of orbital interactions, mechanical properties and electronic band dispersion of the crystal structure become highly sensitive to the amount of applied ... -
Germanene, Stanene and other 2D materials
(Springer, 2017-11)Germanene and stanene (also sometimes written stannene or called tinene) are 2D materials composed of germanium and tin atoms respectively arranged in a honeycomb structure similarly to graphene and silicene. The atomic ...
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