By bombarding very thin slices of several copper/oxygen compounds, called cuprates, with very bright, short-lived pulses of light, Ivan Bozovic, a physicist at the U.S. Department of Energys Brookhaven National Laboratory, and his collaborators have discovered an unusual property of the materials: After absorbing the light energy, they emit it as long-lived sound waves, as opposed to heat energy. This result may open up a new field of study on cuprates -- materials already used in wireless communications and under investigation for other applications in the electronics industry.
As the light pulses strike each film, illuminating an area only about a thousandth of a millimeter across, they transfer their energy to the films atoms. In response, the atoms vibrate, and tiny sound wave "packets," called phonons, spread through the sample. Bozovic observes that, mysteriously, these emitted sound waves do not die out quickly, as they do with other materials. Instead, the atoms oscillate many times before dissipating the absorbed energy. "This is very unusual, as it seems that the atoms find it hard to convert these oscillations into ordinary thermal energy (heat)," said Bozovic.
Through further studies, Bozovic hopes to learn more about this phenomenon, the first step toward finding possible applications for it. For example, this work could contribute to the development of a phaser, a laser-like device that emits phonons instead of light. "Much more research needs to be done," Bozovic said. "We dont know yet how this property might be useful. However, I have little doubt that the phaser would be a very useful scientific tool for a broad new class of experiments," Bozovic said.
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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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An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
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.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...
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