Researchers at the University of Tokyo introduced a new physical model that predicts the dynamics of glassy materials based solely on their local degree of atomic structural order. Using computer simulations, they showed ...
Materials Science
Dec 06, 2019
0
122
A research team has reported seeing, for the first time, atomic scale defects that dictate the properties of a new and powerful semiconductor.
Condensed Matter
Dec 05, 2019
0
5
A scientific team from the Department of Energy's Oak Ridge National Laboratory and Vanderbilt University has made the first experimental observation of a material phase that had been predicted but never seen. The newly discovered ...
General Physics
Nov 18, 2019
0
188
Scientists from the University of Strasbourg, France, in close collaboration with colleagues from research centers in San Sebastián, Spain, and Jülich, Germany, have achieved a breakthrough in detecting the magnetic moments ...
Nanophysics
Nov 04, 2019
0
81
New findings are expected to help protect the hydrogen-producing enzymes from harmful oxygen—which is interesting for biotechnological applications.
Analytical Chemistry
Nov 04, 2019
1
5
Probing the properties of a Mott insulator, a team of researchers from Boston College, MIT, and U.C. Santa Barbara has revealed an elusive atomic-scale magnetic signal in the unique material as it transitions from insulator ...
Quantum Physics
Oct 22, 2019
0
522
Billions of smartphone owners are familiar with the dreaded "low battery" symbol on their devices. While consumers groan, scientists are working to understand why and when lithium-ion batteries in phones, plug-in electric ...
Materials Science
Oct 10, 2019
0
12
Pressure improves the ability of materials to turn heat into electricity and could potentially be used to create clean generators, according to new work from a team that includes Carnegie's Alexander Goncharov and Viktor ...
Materials Science
Oct 07, 2019
7
742
From raindrops rolling off the waxy surface of a waterlily leaf to the efficiency of desalination membranes, interactions between water molecules and water-repellent "hydrophobic" surfaces are all around us. The interplay ...
Nanophysics
Sep 25, 2019
0
8
When exposed to stress and strain, materials can display a wide range of different properties. By using sound waves, scientists have begun to explore fundamental stress behaviors in a crystalline material that could form ...
Condensed Matter
Sep 24, 2019
0
1585
In quantum mechanics, perturbation theory is a set of approximation schemes directly related to mathematical perturbation for describing a complicated quantum system in terms of a simpler one. The idea is to start with a simple system for which a mathematical solution is known, and add an additional "perturbing" Hamiltonian representing a weak disturbance to the system. If the disturbance is not too large, the various physical quantities associated with the perturbed system (e.g. its energy levels and eigenstates) can, from considerations of continuity, be expressed as 'corrections' to those of the simple system. These corrections, being 'small' compared to the size of the quantities themselves, can be calculated using approximate methods such as asymptotic series. We can therefore study the complicated system based on our knowledge of the simpler one.
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