In many chemical elements and their compounds electrons exercise a huge influence over one another. In such cases, physicists talk of electronically correlated solids. Even minor influences, such as temperature, pressure, or magnetic fields, can dramatically alter the properties of these materials. For example, very low temperatures can cause some solids to conduct electricity with no resistance.
Unusual properties of this nature are of interest to basic research and to new technological applications. Correlated materials could well have a big role to play in, say, the development of new sensors, switches, and components.
Correlated solids can be modeled by computer
The properties of correlated solids can be analyzed using computer calculations. A methodological breakthrough has been achieved by researchers in this field with “Dynamic Molecular Field Theory” (DMFT). Over the past ten years, its combination, in particular, with other methods for calculating the electronic properties of solids has produced a completely new process for modeling correlated materials realistically.
“This new approach, however, needs to be developed further so we can also understand and perhaps even predict the properties of complex electronic systems,” say Würzburg professors Fakher Assaad and Ralph Claessen. This goal is being pursued by the new research group of which the two Würzburg physicists are members.
DFG research group with an international network
This is the world’s first coordinated research project in this very topical field of theoretical solid state physics. 25 scientists at 16 research institutes in Germany, Austria, and Switzerland are involved. They are joined by partners, together with whom the group covers almost the entire international community of researchers working in this field.
The German Research Foundation (DFG) will be providing the group with EUR 2.4 million in funding over the next three years. Its spokesperson is Professor Dieter Vollhardt from the Institute of Physics at the University of Augsburg.
Contacts at the University of Würzburg
Prof. Dr. Fakher Assaad, T +49 (0)931 31-83652, email@example.com
Prof. Dr. Ralph Claessen, T +49 (0)931 31-85732, firstname.lastname@example.org
Robert Emmerich | idw
Hope to discover sure signs of life on Mars? New research says look for the element vanadium
22.09.2017 | University of Kansas
22.09.2017 | Forschungszentrum MATHEON ECMath
Plants and algae use the enzyme Rubisco to fix carbon dioxide, removing it from the atmosphere and converting it into biomass. Algae have figured out a way to increase the efficiency of carbon fixation. They gather most of their Rubisco into a ball-shaped microcompartment called the pyrenoid, which they flood with a high local concentration of carbon dioxide. A team of scientists at Princeton University, the Carnegie Institution for Science, Stanford University and the Max Plank Institute of Biochemistry have unravelled the mysteries of how the pyrenoid is assembled. These insights can help to engineer crops that remove more carbon dioxide from the atmosphere while producing more food.
A warming planet
Our brains house extremely complex neuronal circuits, whose detailed structures are still largely unknown. This is especially true for the so-called cerebral cortex of mammals, where among other things vision, thoughts or spatial orientation are being computed. Here the rules by which nerve cells are connected to each other are only partly understood. A team of scientists around Moritz Helmstaedter at the Frankfiurt Max Planck Institute for Brain Research and Helene Schmidt (Humboldt University in Berlin) have now discovered a surprisingly precise nerve cell connectivity pattern in the part of the cerebral cortex that is responsible for orienting the individual animal or human in space.
The researchers report online in Nature (Schmidt et al., 2017. Axonal synapse sorting in medial entorhinal cortex, DOI: 10.1038/nature24005) that synapses in...
Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...
Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!
When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...
For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.
Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...
19.09.2017 | Event News
12.09.2017 | Event News
06.09.2017 | Event News
22.09.2017 | Life Sciences
22.09.2017 | Medical Engineering
22.09.2017 | Physics and Astronomy