Phys.org June 20, 2022 A chiral spin soliton lattice (CSL) exhibits reconfigurability in periodicity over a macroscopic length scale. Such coherent and tunable characteristics of the CSL lead to an emergence of elementary excitation of the CSL and bring a controllability of the dispersion relation of the CSL phonon. An international team of researchers (Japan, Canada, Russia, Germany) used a broadband microwave spectroscopy technique, and directly found that higher-order magnetic resonance modes appear in the CSL phase of a chiral helimagnet CrNb3S6, which is ascribed to the CSL phonon response. The resonance frequency of the CSL phonon can be tuned […]
Nanoparticles control flow of light like road signs direct traffic
Science Daily June 20, 2022 An class of metasurface functionalities is associated with asymmetry in both the generation and transmission of light with respect to reversals of the positions of emitters and receivers. The nonlinear light–matter interaction in metasurfaces offers a promising pathway towards miniaturization of the asymmetric control of light. An international team of researchers (Germany, Australia, Singapore) has demonstrated asymmetric parametric generation of light in nonlinear metasurfaces by assembling dissimilar nonlinear dielectric resonators into translucent metasurfaces that produce images in the visible spectral range on being illuminated by infrared radiation. By design, the metasurfaces produce different and completely […]
New device gets scientists closer to quantum materials breakthrough
Phys.org June 17, 2022 An international team of researchers (USA – UC Berkeley, University of Nebraska, Argonne National Laboratory, Canada) has found a way to combine the advantages of light and matter at room temperature suitable for finding the global minimum of mathematical formulations at room temperature. They used solution-grown halide perovskite grown under nanoconfinement. This produced exceptional smooth single-crystalline large crystals with great optical homogeneity. Its material properties could enable future studies at room temperature rather than ultracold temperatures. They showed that XY spin lattice with many coherently coupled condensates that can be constructed as a lattice with a […]
Organic bipolar transistor developed
Science Daily June 22, 2022 Among materials systems suitable for thin-film electronics, organic semiconductors are of particular interest; their low cost, biocompatible carbon-based materials, and deposition by simple techniques such as evaporation or printing enable organic semiconductor devices to be used for ubiquitous electronics, such as those used on or in the human body or on clothing and packages. An international team of researchers (Germany, Spain) has developed organic bipolar transistors with outstanding device performance: a previously undescribed vertical architecture and highly crystalline organic rubrene thin films yield devices with high differential amplification (more than 100) and superior high-frequency performance […]
Physicists shine light on solid way to extend excitons’ life
Phys.org June 20, 2022 A team of researchers in the US (UT Austin, Auburn University) performed an extensive study of transient optical absorption of both W- and Mo-based single-crystalline monolayer TMDs grown by a recently developed laser-assisted evaporation method. All spectral features of the monolayers as grown on fused silica substrates exhibited appreciable redshifts relating to the existence of strain due to growth conditions. These systems exhibited a dramatic slowing down of exciton dynamics with an increase in carrier densities, which strongly contrasted with the monolayers in their freestanding form as well as in comparison with more traditionally grown TMDs. […]
Quantum sensor can detect electromagnetic signals of any frequency
MIT News June 21, 2022 Quantum sensors can only detect signal fields with frequency in a few accessible ranges, typically low frequencies up to the experimentally achievable control field amplitudes and a narrow window around the sensors’ resonance frequency. A team of researchers in the US (M IT, MIT Lincoln Laboratory) devised a new system, they call a quantum mixer which injects a second frequency into the detector using a beam of microwaves. This converts the frequency of the field being studied into a different frequency which is tuned to the specific frequency that the detector is most sensitive to. […]
Robotic lightning bugs take flight
MIT News June 21, 2022 Inspired by fireflies an international team of researchers (USA – MIT, China) developed a 650 mg aerial robot powered by four electroluminescent (EL) dielectric elastomer actuators (DEAs) that have distinct colors and patterns. They also tweaked the fabrication process so the actuators could emit multicolored and patterned light. To fabricate a glowing actuator, they incorporated electroluminescent zinc sulphate particles into the elastomer. During robot flight, a strong (>40 V/μm) and high frequency (400 Hz) electric field is generated within the DEA, exciting the EL particles to emit light. As they are too light to carry […]
Scientists poke holes in liquid to keep airplanes from freezing on a rainy day
Phys.org June 22, 2022 If the nature of the surface is such that it repels liquid, the very act of replenishing the film by spraying liquid on the surface may create vulnerable dry spots due to droplet collisions with the film. The formation of a stable dry spot has only been studied in the inviscid case. An international team of researchers (Russia, Canada) examined the break-up of viscous films, and demonstrated the importance and role of the viscous dissipation in both film and droplet. They proposed a new model to predict the necessary droplet energy to create a dry spot. […]
Top 10 Science and Technology Inventions for the Week of June 17, 2022
01. Engineers build artificial intelligence chip 02. Building up new data-storage memory 03. New, highly tunable composite materials—with a twist 04. New member added to carbon material family, a two-dimensional monolayer polymeric fullerene 05. Novel fluorescent organohydrogel proposed to achieve dual information encryption 06. Physicists build an atom laser that can stay on forever 07. Superworms capable of munching through plastic 08. Theory suggests quantum computers should be exponentially faster on some learning tasks than classical machines 09. What quantum information and snowflakes have in common, and what we can do about it 10. World’s first ultra-fast photonic computing processor […]
Building up new data-storage memory
EurekAlert June 11, 2022 Researchers in Japan have developed a proof-of-concept 3D stacked memory cell based on ferroelectric and antiferroelectric FETs with atomic-layer-deposited oxide semiconductor channel. The vertical device structure increases information density and reduces operation energy needs. Hafnium oxide and indium oxide layers were deposited in a vertical trench structure. By using antiferroelectric instead of ferroelectric, they found that only a tiny net charge was required to erase data, which leads to more efficient write operations. This work may allow for new even smaller and more eco-friendly data-storage memory. The team experimented with various thicknesses for the indium oxide […]