The image above represents the interference of wave patterns created by simulated atoms that have been "trapped" by intersecting laser beams. The complex shape of peaks and valleys is an example of a natural fractal pattern, a pattern that continues to reveal new details no matter how many times it is magnified. Credit: A.M. Rey/Harvard University
Physicists at Harvard University, George Mason University and the National Institute of Standards and Technology (NIST) have discovered new quantum effects in ultracold gases that may lead to improved understanding of electrical conductivity in metals.
In work presented at the March meeting of the American Physical Society* in Baltimore, Md., the researchers calculated the properties of an "artificial crystal" of ultracold atoms in a lattice formed by intersecting laser beams. The wave patterns in the laser light form the equivalent of row upon row of stadium seating for the atoms, an appropriate analogy given that the work was debuted during the height of college basketball’s "March Madness" tournament.
In metals like copper, two mutually exclusive types of effects tend to slow down the flow of electrons and reduce electrical conductivity, namely disorder in the crystal structure or blocking of electrons by other electrons that are already occupying a given space.
Gail Porter | EurekAlert!
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Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.
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Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.
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Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
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26.05.2017 | Life Sciences
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26.05.2017 | Physics and Astronomy