Strong Polar Optical Phonon Screening and Softening Enhance the Thermoelectric Performance of Zintl Compounds
Sign Up to like & getrecommendations! Published in 2025 at "Advanced Energy Materials"
DOI: 10.1002/aenm.202405024
Abstract: Ternary CaAl2Si2‐structure‐type Zintl compounds are promising p‐type counterparts to n‐type Mg3(Sb, Bi)2 for thermoelectric energy conversion. However, many of these p‐type Zintl compounds suffer from low carrier concentration and mobility, resulting in poor thermoelectric performance.… read more here.
Keywords: zintl; strong polar; thermoelectric performance; zintl compounds ... See more keywords
Ultrafast Processes in Graphene: From Fundamental Manybody Interactions to Device Applications
Sign Up to like & getrecommendations! Published in 2017 at "Annalen der Physik"
DOI: 10.1002/andp.201700022
Abstract: A joint experiment-theory investigation of the carrier dynamics in graphene, in particular in the energetic vicinity of the Dirac point, is reviewed. Radiation of low photon energy is employed in order to match the intrinsic… read more here.
Keywords: optical phonon; energy; graphene fundamental; processes graphene ... See more keywords
High Gain Coefficient Parametric Amplification of Optical Phonon Mode in Magnetized AIIIBV Semiconductor Plasmas
Sign Up to like & getrecommendations! Published in 2020 at "Arabian Journal for Science and Engineering"
DOI: 10.1007/s13369-020-04834-7
Abstract: Using the hydrodynamic (fluid) model of plasmas, we have studied the threshold and gain characteristics of parametric amplification of optical phonon mode in magnetized A III B V semiconductor plasmas. The origin of nonlinear interaction… read more here.
Keywords: frequency; gain coefficient; gain; optical phonon ... See more keywords
Specific heat analyses on optical-phonon-derived uniaxial negative thermal expansion system TrZr2 (Tr = Fe and Co1− xNix)
Sign Up to like & getrecommendations! Published in 2024 at "Scientific Reports"
DOI: 10.1038/s41598-024-79353-8
Abstract: A large uniaxial negative thermal expansion (NTE) along the c-axis has recently been observed in the transition metal (Tr) zirconides TrZr2 with a tetragonal CuAl2-type structure. A recent study on FeZr₂ [M. Xu et al.,… read more here.
Keywords: phonon; thermal expansion; along axis; specific heat ... See more keywords
Surface optical phonon propagation in defect modulated nanowires
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Applied Physics"
DOI: 10.1063/1.4976564
Abstract: Planar defects, such as stacking faults and twins, are the most common defects in III–V semiconductor nanowires. Here we report on the effect of surface perturbation caused by twin planes on surface optical (SO) phonon… read more here.
Keywords: surface optical; phonon propagation; optical phonon; propagation defect ... See more keywords
Optical absorption of Fröhlich polaron in monolayer transition metal dichalcogenides
Sign Up to like & getrecommendations! Published in 2018 at "Journal of Applied Physics"
DOI: 10.1063/1.5030678
Abstract: We theoretically study the optical absorption of a Frohlich polaron in monolayer transition metal dichalcogenides (TMDS) on different polar substrates using the Devreese-Huybrechts-Lemmens model, in which both the surface optical phonon modes induced by the… read more here.
Keywords: absorption; optical absorption; optical phonon; polaron monolayer ... See more keywords
Electron–optical-phonon scattering rates in cubic group III-nitride crystals: path-integral corrections to Fermi golden rule matrix elements
Sign Up to like & getrecommendations! Published in 2020 at "Semiconductor Science and Technology"
DOI: 10.1088/1361-6641/abd045
Abstract: III-nitride semiconductors with a cubic crystal structure have shown promise in enhancing efficiency in photonic and optoelectronic applications. The recent interest in cubic III-nitrides has arisen due to the inability to realize enhanced efficiency in… read more here.
Keywords: electron optical; iii nitride; corrections fermi; optical phonon ... See more keywords
Analytical insight into caffeine extraction from typica coffee leaves based on crystallinity enhancement, optical phonon vibration upshift, and morphological evolution.
Sign Up to like & getrecommendations! Published in 2024 at "Journal of food science"
DOI: 10.1111/1750-3841.17443
Abstract: Caffeine extracted from callus cultures by in vitro technique induced from typica coffee (Coffea arabica L. var. typica) leaves was successfully carried out by a simple Soxhlet method. Analysis of X-ray diffraction patterns showed an… read more here.
Keywords: caffeine; culture; optical phonon; typica coffee ... See more keywords
Electro-optical and phonon properties of PbTiO3/CaTiO3/SrTiO3 ferroelectric superlattices: a first-principles calculation
Sign Up to like & getrecommendations! Published in 2021 at "Journal of Nanophotonics"
DOI: 10.1117/1.jnp.15.026003
Abstract: Abstract. We studied the electronic structure as well as the dielectric, optical, and phonon properties of PbTiO3 / CaTiO3 / SrTiO3 ferroelectric superlattices, based on the density functional theory, using the Perdew–Becke–Johnson-generalized gradient approximation exchange-correlation functional. According to the… read more here.
Keywords: optical phonon; phonon properties; catio3 srtio3; properties pbtio3 ... See more keywords
Ultrafast Spectroscopy of Fano-Like Resonance between Optical Phonon and Excitons in CdSe Quantum Dots: Dependence of Coherent Vibrational Wave-Packet Dynamics on Pump Fluence
Sign Up to like & getrecommendations! Published in 2017 at "Nanomaterials"
DOI: 10.3390/nano7110371
Abstract: The main goal of the present work is to study the coherent phonon in strongly confined CdSe quantum dots (QDs) under varied pump fluences. The main characteristics of coherent phonons (amplitude, frequency, phase, spectrogram) of… read more here.
Keywords: dependence; optical phonon; pump fluence; phonon ... See more keywords