Dielectric function for free electron gas: comparison between Drude and Lindhard models

Andrade-Neto, A. V.

doi:10.1590/1806-9126-rbef-2016-0206

Cited by 9 publications

(6 citation statements)

References 8 publications

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“…The summation of all the dipole moments is the electronic polarization field trueP→, which has a phase delay compared to trueE→, and is related to it through the frequency-dependent parameter of electrical permittivity trueε¯ as normalP→~sans-serifε¯.normalE→ [108]. Similar to the refraction function, trueε¯ is also a complex function and comprises a real part ε, indicating the degree to which the medium can be polarized, and an imaginary component ἐ is associated with the attenuation of an electromagnetic wave passing through the medium [109]. Figure 7c,d compares the permittivity function of the Group B samples.…”

Section: Discussionmentioning

confidence: 99%

Enhanced Sol–Gel Route to Obtain a Highly Transparent and Conductive Aluminum-Doped Zinc Oxide Thin Film

Nateq

Ceccato

2019

Materials

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The electrical and optical properties of sol–gel derived aluminum-doped zinc oxide thin films containing 2 at.% Al were investigated considering the modifying effects of (1) increasing the sol H2O content and (2) a thermal treatment procedure with a high-temperature approach followed by an additional heat-treatment step under a reducing atmosphere. According to the results obtained via the TG-DTA analysis, FT-IR spectroscopy, X-ray diffraction technique, and four-point probe resistivity measurements, it is argued that in the modified sample, the sol hydrolysis, decomposition of the deposited gel, and crystallization of grains result in grains of larger crystallite size in the range of 20 to 30 nm and a stronger c-axis preferred orientation with slightly less microstrain. The obtained morphology and grain-boundary characteristics result in improved conductivity considering the resistivity value below 6 mΩ·cm. A detailed investigation of the samples’ optical properties, in terms of analyzing their absorption and dispersion behaviors through UV-Vis-NIR spectroscopy, support our reasoning for the increase of the mobility, and to a lesser extent the concentration of charge carriers, while causing only a slight degradation of optical transmittance down to nearly 80%. Hence, an enhanced performance as a transparent conducting film is claimed for the modified sample by comparing the figure-of-merit values.

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Section: Discussionmentioning

confidence: 99%

Enhanced Sol–Gel Route to Obtain a Highly Transparent and Conductive Aluminum-Doped Zinc Oxide Thin Film

Nateq

Ceccato

2019

Materials

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“…The optical response of these materials according to the frequency and wave vector is dependent on the dielectric function of a free electron gas, which is used as a fundamental factor for studying the optical properties of materials. Therefore, optical absorption is determined by the imaginary part of the dielectric function, which is dependent on the real part of the optical conductivity [56]. In figure 4, we can see that the optical absorption at zero frequency is non-zero due to the inter-band transition caused by the Drude response or ballistic transport.…”

Section: Numerical Resultsmentioning

confidence: 99%

Optical properties of methyl-substituted germanane monolayer in the presence of the external magnetic field, strain and spin–orbit coupling

Abdi

Astinchap

2023

J. Phys.: Condens. Matter

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In this research, we use the tight-binding (TB) model, which includes spin-orbit coupling and an external magnetic field, to describe the optical properties of the methyl-substituted Germanane(GeCH3) monolayer. We have applied the Kubo formula, linear response theory, and Green's function approach to calculate the optical absorption coefficient of the GeCH3 monolayer. Here, the effects of an external magnetic field, strain, spin-orbit coupling, temperature, and electron/hole doping on the frequency dependence behavior of the optical conductivity have been investigated in detail. Our numerical results show that the weight of the Drude increases with increasing the external magnetic field, strain, and electron doping. The optical absorption peak decreases and shifts to higher frequencies by applying an external magnetic field, strain, and electron doping. Controlling the optical and electronic properties of GeCH3 is leading to the use of this structure it in the electronic and optoelectronic industries.

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“…In particular, considering Lindhard-like behaviour, we derived the real and imaginary dielectric constants for Au-Ag materials. According to the Lindhard model the real part of dielectric function (𝜀 ′ ) of an material can be expressed as 34,35 𝜀 ′ = 𝜀 ∞ − 𝜔 𝑝 2 (𝜔 2 − 𝛾 𝐿 2 )…”

Section: Parameter 300kv Operation 80kv Operationmentioning

confidence: 99%

Investigation of the dissipative properties of Au-Ag nanostructures through Electron Energy Loss Spectroscopy

Saha

Mondal

Channagiri

et al. 2022

Preprint

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We describe the unusual dielectric properties of Au-Ag nanostructures at a single particle level using electron energy loss spectroscopy. It has been shown previously that these nanostructures deviate from their usual metallic characteristics of metallic Ag and Au. In particular certain variants of these materials appear to undergo a transition to an immeasurably low resistive state as well as a strong diamagnetic state that is not usually associated with Au and Ag themselves. More significantly these nanostructures exhibit absence of Mie like resonances associated with Au and Ag. Instead, these exhibit negligible optical absorption in the UV-VIS-NIR range. Here this unconventional electromagnetic response was probed at a single particle level. We find that the absence of dissipation is also reflected in the electron loss spectra. The lack of distinct electron energy loss features in particles with a known composition enables us to unambiguously assign these observations to actual particle properties. We tentatively interpret our observations as arising due to a reduction of free electron density in Au and Ag nanostructures. Further it was also shown that the conventional plasmonic modes can be recovered by altering material composition.

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Dielectric function for free electron gas: comparison between Drude and Lindhard models

Cited by 9 publications

References 8 publications

Enhanced Sol–Gel Route to Obtain a Highly Transparent and Conductive Aluminum-Doped Zinc Oxide Thin Film

Enhanced Sol–Gel Route to Obtain a Highly Transparent and Conductive Aluminum-Doped Zinc Oxide Thin Film

Optical properties of methyl-substituted germanane monolayer in the presence of the external magnetic field, strain and spin–orbit coupling

Investigation of the dissipative properties of Au-Ag nanostructures through Electron Energy Loss Spectroscopy

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