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Raman spectra are reported from single crystals of graphite and other graphite materials. Single crystals of graphite show one single line at 1575 cm−1. For the other materials like stress-annealed pyrolitic graphite, ...

We present ab initio quantum-mechanical molecular-dynamics simulations of the liquid-metal--amorphous-semiconductor transition in Ge. Our simulations are based on (a) finite-temperature density-functional theory of the o...

The term ``sensitized luminescence'' in crystalline phosphors refers to the phenomenon whereby an impurity (activator, or emitter) is enabled to luminesce upon the absorption of light in a different type of center (sensi...

A modification of the nudged elastic band method for finding minimum energy paths is presented. One of the images is made to climb up along the elastic band to converge rigorously on the highest saddle point. Also, varia...

A structure refinement method is described which does not use integrated neutron powder intensities, single or overlapping, but employs directly the profile intensities obtained from step-scanning measurements of the pow...

The dispersion and absorption of a considerable number of liquid and dielectrics are represented by the empirical formula ε*−ε∞=(ε0−ε∞)/[1+(iωτ0)1−α]. In this equation, ε* is the complex dielectric cons...

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The theory of the kinetics of phase change is developed with the experimentally supported assumptions that the new phase is nucleated by germ nuclei which already exist in the old phase, and whose number can be altered b...

Abstract The optical constants of amorphous Ge are determined for the photon energies from 0.08 to 1.6 eV. From 0.08 to 0.5 eV, the absorption is due to k ‐conserving transitions of holes between the valence bands as i...

A new Lagrangian formulation is introduced. It can be used to make molecular dynamics (MD) calculations on systems under the most general, externally applied, conditions of stress. In this formulation the MD cell shape a...

Materias / palabras clave: Graphene; Physics; Theoretical physics; Nanotechnology; Engineering physics; Quantum mechanics; Materials science

Topological insulators are electronic materials that have a bulk band gap like an ordinary insulator but have protected conducting states on their edge or surface. These states are possible due to the combination of spin...

This article reviews the current status of lattice-dynamical calculations in crystals, using density-functional perturbation theory, with emphasis on the plane-wave pseudopotential method. Several specialized topics are ...

Spintronics, or spin electronics, involves the study of active control and manipulation of spin degrees of freedom in solid-state systems. This article reviews the current status of this subject, including both recent ad...

Topological insulators are new states of quantum matter which cannot be adiabatically connected to conventional insulators and semiconductors. They are characterized by a full insulating gap in the bulk and gapless edge ...

Materias / palabras clave: quantum science, quantum materials, quantum applications, topological materials, quantum dots, two-dimensional materials; Science: Physics

Materias / palabras clave: materials, solid state, condensed matter physics, physics devices, chemical physics, crystallography; Science: Chemistry: Crystallography; Science: Chemistry: Physical and theoretical chemistry

Materias / palabras clave: quantum materials, quantum computing, materials science, quantum information; Science: Physics: Atomic physics. Constitution and properties of matter; Technology: Electrical engineering. Electronics. Nuclear engineering:...

Materias / palabras clave: nuclear physics, high energy physics, radiation ecology, alternative energy, functional materials, high technologies; Science: Physics

Materias / palabras clave: physics, materials physics, quantum physics, climate physics, mathematical physics, astrophysics; Science: Physics

Materias / palabras clave: electronics, electronic materials, magnetic materials, materials science, device physics, organic electronics; Technology: Electrical engineering. Electronics. Nuclear engineering: Electric apparatus and materials. Elect...

Materias / palabras clave: physics, chemistry, materials science, engineering, biology, medicine; Science: Physics

Materias / palabras clave: medical physics, applied physics, materials science, theoretical physics, computational physics; Science: Physics

Materias / palabras clave: condensed matter and materials, atomic molecular and optical physics, cosmology and astrophysics, nuclear physics, particles and fields, quantum information science and technology; Science: Physics