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Exchange-Correlation Hole of a Generalized Gradient Approximation for Solids and Surfaces
(American Physical Society, 2009-02)
We propose a generalized gradient approximation (GGA) for the angle- and system-averaged exchange-correlation hole of a many-electron system. This hole, which satisfies known exact constraints, recovers the Perdew-Burke-Ernzerhof ...
Acoustic plasmons in extrinsic free-standing graphene
(IOP Publishing, 2014-08-04)
An acoustic plasmon is predicted to occur, in addition to the conventional two-dimensional (2D) plasmon, as the collective motion of a system of two types of electronic carriers coexisting in the same 2D band of extrinsic ...
Unconventional spin texture of a topologically nontrivial semimetal Sb(110)
(IOP Publishing LTD, 2012-10-17)
The surfaces of antimony are characterized by the presence of spin-split states within the projected bulk band gap and the Fermi contour is thus expected to exhibit a spin texture. Using spin-resolved density functional ...
Upgrading the Performance of Cholesteric Liquid Crystal Lasers: Improvement Margins and Limitations
(MDPI, 2017)
The topic of cholesteric-liquid-crystal lasers is a rapidly expanding research area in the field of soft-matter photonics. The increasing interest in this field is due to the high versatility that these lasers may possibly ...
Reversible and Non-Reversible Transformation of Magnetic Structure in Amorphous Microwires
(MDPI, 2020-07-24)
We provide an overview of the tools directed to reversible and irreversible transformations of the magnetic structure of glass-covered microwires. The irreversible tools are the selection of the chemical composition, ...
Influence of Nb on Ti Diffusion in Gamma-TiAl Intermetallics Studied by Mechanical Spectroscopy
(Elsevier, 2021-01-25)
The development of intermetallic titanium aluminides has been driven by the aeronautic and aerospace industries because of the excellent mechanical properties and low density of gamma-TiAl based alloys. Up to now, several ...
Atomistic Simulations of Geopolymer Models: The Impact of Disorder on Structure and Mechanics
(ACS, 2018-06-13)
Geopolymers are hydrated aluminosilicates with excellent binding properties. Geopolymers appeal to the construction sector as a more sustainable alternative to traditional cements, but their exploitation is limited by a ...
On a Common Mistake in the Description of the Photoelectric Effect
(AIP, 2019-11-01)
The photoelectric effect is one of the key experiments taught during first- or second-year university and high school modern physics courses. It is usually the first experiment to introduce light quantization and the concept ...
Importance of the spectral emissivity measurements at working temperature to determine the efficiency of a solar selective coating
(Elsevier, 2015-09-01)
The total emissivity of the absorbing surfaces is a critical parameter in the calculation of the radiative thermal losses in solar thermal collectors. This is because the radiative heat losses have a significant economic ...
Experimental verification of the anomalous skin effect in copper using emissivity measurements
(AIP, 2013-06-20)
Spectral directional emissivity has been measured in copper between 3 and 24 μm above room temperature. The experimental spectrum shows a weak broad peak between 7 and 14 μm, which is much more acute for higher emission ...