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Nanotechnology Now - Press Release: Use of perovskite will be a key feature of the next generation of electronic appliances: Nanomaterials of perovskite dispersed in hexane and irradiated by laser; light emission by these materials is intense thanks to resistance to surface defects

Nanotechnology Now - Press Release: Use of perovskite will be a key feature of the next generation of electronic appliances: Nanomaterials of perovskite dispersed in hexane and irradiated by laser; light emission by these materials is intense thanks to resistance to surface defects
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Use of perovskite will be a key feature of the next generation of electronic appliances

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IMAGE: Nanomaterials of perovskite dispersed in hexane and irradiated by laser. Light emission by these materials is intense thanks to resistance to surface defects
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Credit: Luiz Gustavo Bonato
Quantum dots are manmade nanoparticles of semiconducting material comprising only a few thousand atoms. Because of the small number of atoms, a quantum dot s properties lie between those of single atoms or molecules and bulk material with a huge number of atoms. By changing the nanoparticles size and shape, it is possible to fine-tune their electronic and optical properties - how electrons bond and move through the material, and how light is absorbed and emitted by it. ....

Rio Grande Do Sul , United States , Luiz Gustavo Bonato , Steven Cundiff , Diogo Almeida , University Of Michigan , Physics Institutes Of The University Campinas , Chemistry Institute , Engineering Research Center , Paulo Research Foundation , Research Division , Research Grant , Physics Institutes , Padilha Junior , Young Investigator Grant , Regular Research Grant , New Energies , Chemistry Physics Materials Sciences , Superconductors Semiconductors , Nanotechnology Micromachines , Particle Physics , ரியோ கிராண்டே செய் சூழ் , ஒன்றுபட்டது மாநிலங்களில் , ஸ்டீவன் கன்டிஃப் , டியோகோ அல்மேடா , பல்கலைக்கழகம் ஆஃப் மிச்சிகன் ,

Second order optical merons, or light pretending to be a ferromagnet

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IMAGE: Spin texture of a second-order half-skyrmion (meron) on the surface of a birefringent cavity. (Source: Physics UW, M. Krol)
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Credit: Source: Physics UW, M. Krol
The scientists have demonstrated how to structure light such that its polarization behaves like a collective of spins in a ferromagnet forming half-skyrmion (also known as merons). To achieve this the light was trapped in a thin liquid crystal layer between two nearly perfect mirrors. Skyrmions in general are found, e.g., as elementary excitations of magnetization in a two-dimensional ferromagnet but do not naturally appear in electromagnetic (light) fields.
One of the key concepts in physics, and science overall is the notion of a field which can describe the spatial distribution of a physical quantity. For instance, a weather map shows the distributions of temperature and pressure (these are known as scalar fields), as well as the wind speed and direction (known as ....

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