Articles tagged with Phonons
Researchers uncover a new mechanism for lowering thermal conductivity in a unique material, which could aid the search for materials converting heat to electricity or vice versa. The discovery reveals a quantum mechanical twist on what drives exceptional thermoelectric properties.
Researchers at Penn State and UC San Diego found a new method to tune the magnetic properties of manganese bismuth telluride, enabling efficient control of lossless electrical currents. The discovery uses phonons to modify the magnetic bonding between layers, potentially leading to ultra-fast devices with reduced energy waste.
Researchers from the University of Würzburg have discovered new states in 2D materials by exploring their interactions with phonons. This breakthrough enables the creation of hybridized exciton-photon-phonon states, which could lead to room-temperature Bose-Einstein condensation and polariton lasing.
Rice University scientists discovered that strong magnetic fields can manipulate the material's optical phonon mode, a phenomenon previously unseen. The effects were much stronger than expected by theory, revealing a new way of controlling phonons.
Researchers employed microscopy techniques to study the atomic structure and vibrations of perovskite oxides in superlattices. The discovery enables the rational design of materials with unique photonic and phononic properties.
MIT physicists detected a hybrid particle composed of an electron and phonon, with a bond 10 times stronger than known hybrids. The discovery could enable scientists to manipulate material properties through dual control, leading to new magnetic semiconductors and ultra-efficient electronics.
Researchers at JAIST have demonstrated a high thermal rectification ratio on suspended asymmetric graphene nanomesh devices at low temperatures. The device shows promise for developing a high-efficiency thermal rectifier based on graphene nanomesh structure.
Researchers at Georgia Tech and collaborators observed interfacial phonon modes, confirming their existence and contribution to heat transfer at interfaces. The discovery opens a new pathway for consideration in engineering thermal conductance for electronics cooling.
A new study from Pusan National University suggests that phonological awareness (PA) and phonics instruction can significantly improve the reading skills of English language learners. The meta-analysis of 46 studies found a moderate effect of PA and phonics on word reading, but a larger impact on pseudo-word reading.
Researchers from Peking University developed a new technique using 4D-EELS to measure phonon modes at heterointerfaces, directly observing localized phonon modes for the first time. This breakthrough enables better understanding and control of solid interfaces' properties.
Researchers at Stanford University have developed a new device that brings sound to quantum science experiments, opening up new possibilities for studying solids and phases of matter. The device uses a precise cavity to hold an optical lattice of atoms, which vibrates at around 1 kHz, producing phonons - the building blocks of sound.
The study reveals that the interaction between phonons and electrons is crucial for ultrafast demagnetization. The data show a temperature threshold below which this mechanism does not occur, indicating another microscopic mechanism at lower temperatures.
Scientists from Tokyo Institute of Technology have discovered a new method to manipulate quantum vibrations in solids using polarized light pulses. The research demonstrates the importance of polarization in controlling these vibrations, which could lead to breakthroughs in quantum control and material properties.
A team of researchers from Boston College has created a new metallic specimen where electron motion flows in a fluid-like manner, fundamentally changing particle-like to hydrodynamic dynamics. The discovery confirms theoretical predictions and opens up new possibilities for material exploration and potential applications.
Graphene drum technology induces coherent emission of sound energy quanta, enabling new quantum optomechanical sensors and transducers. The device amplifies external vibrations at specific frequencies, showing potential applications in classical and quantum sensing.
Researchers have demonstrated cooling a large-scale object to nearly the motional quantum ground state, increasing sensitivity in detecting gravitational waves. The method achieved an average phonon occupation of 10.8, suppressing quantum back-action noise by 11 orders of magnitude.
Researchers at NIST successfully entangled two small aluminum drums, measuring the subtle statistical relationships between their motions. They analyzed radar-like signals to verify the fragile entanglement, demonstrating a new capability in large-scale quantum networks.
Scientists at the University of Nottingham have developed an ultrasonic imaging system that can visualize cell abnormalities in 3D using a fiber-optic probe. The technology produces high-resolution images with nanoscopic resolution, enabling more effective diagnoses for diseases such as gastric cancer and bacterial meningitis.
Scientists at Graz University of Technology have successfully imaged surface phonons in three dimensions, revealing the spatial distribution of electromagnetic fields near nanosurfaces. This breakthrough could lead to improved thermal conduction, sensor technology, and energy storage.
Researchers have discovered a way to twist material properties by stacking and slightly rotating 2D layers, which significantly influences the material's properties. This phenomenon, known as the Moiré effect, allows for control over phonon vibrations, potentially leading to new applications in materials science.
Researchers at HZB have developed a method to control lattice vibrations in graphene, enabling the creation of phononic crystals with tunable properties. This breakthrough paves the way for applications in ultrasensitive sensors and quantum technologies.
Researchers perform an experiment that adds or subtracts a single phonon to a high-frequency sound field using laser light interactions. The team's findings show that subtracting a single phonon increases the average number of quanta, defying intuition. This result opens a new path for quantum science and technology with sound waves.
Researchers discovered that complex oscillations in quantum systems decay over time into a simple Gaussian distribution, driven by interactions. The Vienna group created a synthetic Bose-Einstein condensate to study phonon dynamics, which eventually lost complexity and followed the Gaussian shape.
Researchers developed a new theoretical model explaining the spread of vibrations in disordered materials, showing that sound waves lose coherence on shorter length scales. This discovery may lead to the design of heat- and shatter-resistant glass for smartphones and tablets.
Researchers at UCI used advanced electron microscopy to study phonons near defects in cubic silicon carbide, a material used in electronic devices. The team's findings could improve thermal properties and provide insights into defect structures.
Scientists have successfully demonstrated the interaction between infrared light and molecular vibrations, leading to the formation of hybrid polaritons. The study's findings could pave the way for ultrasensitive spectroscopy devices and a deeper understanding of strong vibrational coupling on the nanoscale.
Researchers at Oak Ridge National Laboratory and the University of Tennessee discovered a way to slow phonons, waves that transport heat, in photovoltaic materials. This discovery holds promise for improving novel hot-carrier solar cells, which convert sunlight to electricity more efficiently than conventional solar cells by harnessing...
Researchers at the University of Rochester developed an anti-resonant hollow-core fiber that produces significantly less noise compared to traditional single-mode fibers. This breakthrough enables promising platforms for low-noise applications, including quantum information processing and optical communications.
Researchers develop novel approach for efficient generation of coherent vibrations using semiconductor structures. The phonon laser operates in the tens of GHz range and is based on Einstein's predictions for Bose-Einstein condensates of coupled light-matter particles.
Researchers have discovered strong evidence of quantum fluctuations near a quantum critical point in a copper oxide material, which could lead to new understanding of high-temperature superconductivity. The study used RIXS to map out phonon vibrations and observed unexpectedly strong charge order excitations at the QCP.
Scientists have demonstrated a 'hammer-on' effect in crystals by switching the frequency of atomic motions with an impulsively generated electric current. The technique allows for faster playing and legato, similar to rock guitarists using the hammer-on method.
The US Army has made significant advancements in quantum networking research, which will play a crucial role in future battlefield operations. The researchers have developed a system that can send information quantum-mechanically between nodes without occupying the linking channel.
Scientists at the University of Chicago have developed a new quantum communication technique that bypasses traditional channels, allowing for secure information transfer without photon loss. This breakthrough enables faster and more efficient communication systems, opening up new possibilities for future technologies.
Scientists at Osaka University have successfully demonstrated a quantum random walk using trapped ions, which may lead to new quantum simulations of biological systems. The technique relies on precise control of individual ions and can help resolve open questions in chemistry and biology.
An international team has discovered an effective method for controlling the frequency of confined light at the nanoscale in phonon polaritons. By intercalating alkaline and alkaline earth atoms in van der Waals materials, researchers can extend the range of working frequencies, enabling broader technological applications.
Researchers at the University of Innsbruck have developed a method to cool microparticles using sound waves, enabling quantum experiments without photons. This innovative approach also provides a path to probe and manipulate exotic dynamics of acoustic and magnetic waves in small particles.
Scientists have demonstrated tunable coherent phonon dynamics in nanomechanical resonators, enabling new possibilities for information storage and processing. The work shows high cooperativity and large coupling strength between non-neighbouring phonon modes.
A UC Riverside-led research team has discovered a new quantum process in valleytronics that can speed up the development of this emerging technology. The breakthrough, which uses local energy minima in semiconductors, enables the creation of information processing schemes superior to current charge-based technologies.
Physicists at EPFL's Institute of Physics have successfully created a single phonon in ambient conditions, allowing them to study quantum phenomena in naturally occurring materials. The breakthrough enables the creation of room-temperature ultrafast quantum technologies with potential applications in various fields.
Researchers create and observe a single phonon in diamond at room temperature, bringing quantum behavior closer to everyday life. This breakthrough technique can now be used to probe other materials for quantum vibrations, potentially leading to advancements in solar cells and quantum computing.
Scientists have identified an unusual electron scattering phenomenon in hybrid systems of Bose-Einstein condensates and 2D electron gases. This discovery opens up new possibilities for designing high-temperature superconductors by exploiting the unique interactions between electrons and Bogoliubov quanta.
Researchers at NUS have discovered a new quasiparticle, the polaronic trion, in molybdenum disulphide that can be tuned by both temperature and electric fields. This enables significant tunability in optoelectronic properties.
Researchers create device that exploits quantum principles to detect phonons, enabling precise measurement of individual sound particles and paving the way for new types of quantum devices. This breakthrough could lead to more compact and efficient quantum computers that operate by manipulating sound rather than light.
A team of scientists has developed a method to study ultrafast spin-flip scattering rates in ferromagnetic Nickel and nonmagnetic copper using X-ray emission spectroscopy. As temperature increases, ferromagnetic nickel shows a decrease in emissions due to increased electron-phonon interactions.
Scientists at Tokyo Institute of Technology investigated photogenerated coherent phonons in GaAs using ultrafast dual pump-probe laser for quantum interferometry. They found that impulsive stimulated Raman scattering (ISRS) dominates phonon generation, with ISRS causing zapping of vibrations in the solid lattice.
Scientists demonstrate amplification of optical phonons in a metal-semiconductor nanostructure using THz pulses, showing potential for ultrasound imaging with sub-nanometer resolution. The amplification process relies on population inversion and stimulated emission of phonons.
Scientists have observed a new mode of heat transport in graphite, known as second sound, which behaves like sound when moving through the material. At temperatures above 80K, heat travels through graphite as a wave, cooling points instantly and carrying heat away at close to the speed of sound.
Researchers found that when compressed, cubic boron arsenide's heat conductivity improves initially but then deteriorates due to competition between different processes. This behavior has never been predicted or observed before and challenges conventional understanding of heat conduction.
Researchers have created a quantum fridge with just three atoms, demonstrating the role of quantum effects in thermodynamics. The device, using heat to drive cooling without moving parts, achieves temperatures within 40 microKelvin of absolute zero.
Researchers developed a new method to predict lattice thermal conductivity of solids with high accuracy, removing the need for fitting parameters. This improvement enables more precise design of thermally resistive materials, including those used in thermoelectrics.
A team of international researchers has developed a lasing system that produces phonons, the energy products of oscillation, or vibration. By tuning the system to create resonance, they can trigger mechanical movement that generates an acoustic wave. This breakthrough could lead to new medical and materials science applications.
Researchers at Tokyo Institute of Technology successfully formulated and experimentally verified a unified theory for controlling coherent optical phonons in diamond. The theory explains the generation and detection of coherent optical photons based on a model involving two states of electrons and the quantum harmonic oscillator.
A team of researchers has found a way to couple and precisely control quantum systems using phonons, the smallest units of sound waves. This allows for the creation of a scalable quantum network, enabling new technological breakthroughs.
Researchers create method to detect individual phonons, enabling study of phonon decay and its implications for quantum technologies. The technique uses ultra-short laser pulses to excite and probe phonons in diamond crystals.
Victor Lakhno proposes a new theoretical model for room-temperature superconductivity based on translation-invariant bipolarons. This approach suggests that even small concentrations of TI-bipolarons can enhance critical temperatures, opening up opportunities for creating such materials.
By doping aluminum oxide with neodymium, researchers can control phonon frequencies and speeds, leading to improved thermal conductivity and efficiency in thermoelectric devices. This breakthrough provides a simpler and cheaper way to tune material properties, enabling new applications in solid-state lighting and electronics.
Scientists have discovered a new way to modify phonon response in nanomaterials by harnessing zero-point energy, opening up possibilities for nanophotonics and nanoelectronics applications. The researchers created hybrid nanosystems with novel optical phonon properties.
Researchers found naturally occurring circular rotation in an atomic monolayer crystal of tungsten diselenide, a promising candidate for valleytronics. Controlling this rotation could provide a stable mechanism to carry and store information. The discovery opens possibilities for creating rotors at the molecular scale.
Scientists have successfully achieved strong coupling between distant phonon modes of graphene-based mechanical resonators using a phonon cavity mode. By tuning the resonant frequency of the phonon cavity mode, they can continuously tune the coupling strength between distant phonon modes.
Researchers at UC Riverside used ultraviolet Raman spectroscopy to investigate the strength of electron spin interactions with phonons in antiferromagnetic nickel oxide crystals. The study sheds light on long-standing puzzles surrounding this material and has important implications for developing spintronic devices.