Articles tagged with Phonons
An international team of physicists has made a breakthrough in understanding heat transport at the nanoscale by studying a chain of gold atoms. The study confirms the validity of the Wiedemann-Franz law, which describes the relationship between electric and thermal conductance.
Researchers have discovered that localized vibrations in amorphous silicon dioxide contribute substantially to the material's thermal conductivity, contradicting previous assumptions. This breakthrough could lead to more efficient forms of everyday materials and even superconducting materials.
Researchers found that adding cone-like structures between graphene and nanotubes enhances heat dissipation by reducing the number of heptagons. This could lead to improved performance in next-generation nano-electronics.
Researchers at UCR have discovered a way to control the flow of heat in electronic devices using semiconductor nanowires. By confining acoustic phonons to these nanostructures, they can alter their energy spectrum and improve thermal management.
Physicists adapt BCS theory to externally drive phonon interaction, elevating critical temperature and creating higher-temperature superconductors. Theoretical approach reveals controlled elevation of critical temperature through time-averaging procedure.
Researchers have observed and quantified the coupling of phonons and magnons in crystals of antiferromagnet manganite (Y,Lu)MnO3. This discovery challenges a 100-year-old physical problem and deepens knowledge of multiferroics, materials that exhibit multiple types of order simultaneously.
Scientists at Rice University found a phonon band gap in spider silk, enabling the material to block certain frequencies of sound waves. This discovery has implications for creating tunable, dynamic metamaterials with novel sound or thermal insulation properties.
NIST researchers create a piezo-optomechanical circuit that converts signals among optical, acoustic and radio waves. The system enables manipulating motion of nanoscale beam using energy exchange between phonons and photons.
Researchers at Osaka University have successfully observed two-phonon quantum interference using two cold calcium ions in ion traps. This achievement demonstrates the shared properties of phonons and photons, paving the way for quantum simulation and interface research.
A new experiment by MIT engineers provides a more nuanced picture of heat production in microelectronics. The researchers devised an experiment to measure the mean free path distribution of phonons, which reveals that classical diffusion theory underestimates temperature rise at extremely small length scales.
Researchers at Rice University have developed a method to fine-tune the acoustic response of nanoparticles by varying the thickness of their attachment layer, opening doors for new applications in photonics and wireless communications. This breakthrough uses ultrafast laser pulses to induce atomic vibrations in gold nanodisks.
Researchers at Sandia National Laboratories have found a way to alter the thermal conductivity of widely used material PZT using a small electric voltage. This breakthrough could lead to new technologies where controlling phonons is necessary, and has potential applications in computing, global communications, and other fields.
Heat flow between materials separated by less than a nanometer occurs not via radiation or conduction, but through phonon tunneling. Researchers developed a unified framework to calculate heat transport at finite gaps, explaining how phonons can
Researchers at Ohio State University have discovered a way to control heat with magnetic fields, using acoustic phonons to steer heat magnetically. This breakthrough opens up new possibilities for energy manipulation, potentially allowing for the control of sound waves as well.
Scientists at the University of Illinois have determined the physical process dominating heat flow between metals and diamond, challenging previous theories. By applying extreme pressure to metal films on diamond, researchers found that phonons can 'feed' a higher frequency diamond phonon, regardless of metal stiffness.
A team of engineers and scientists has identified a source of electronic noise that could impact the functioning of instruments operating at very low temperatures. At around 20 kelvins, phonon modes become deactivated, allowing high-energy phonons to carry away heat and causing devices to heat up.
Researchers at Oak Ridge National Laboratory quantify thermodynamic forces driving metal-insulator transition in vanadium dioxide, finding phonons and atomic vibrations control phase stability. The discovery has implications for multifunctional materials, including colossal magnetoresistors, superconductors, and ferroelectrics.
Researchers have demonstrated a technique for producing acoustic phonons at 10 GHz, promising unprecedented resolution for acoustic imaging. The team used nanostructures to generate and detect the phonons, which can be used to 'see' subsurface structures in nanoscale systems.
Scientists at the University of Jyväskylä, Finland, have demonstrated that it's possible to change a material's thermal conductance by tuning the wave-like properties of heat flow. By fabricating a nanoscale mesh structure, they were able to reduce phonon thermal conductance by almost an order of magnitude.
Scientists at Berkeley Lab have provided the first 'unambiguous demonstration' of phonon-based lasers by observing coherent phonon transport in superlattices. This breakthrough could lead to new advances in heat transfer applications and the development of phonon lasers.
Researchers have discovered a way to control heat flow using tiny triangular structures that can 'thermal rectify', allowing for greater flow of heat in one direction. The technology has potential applications in thermal management, electronics, and textiles.
Researchers have developed phononic properties to control sound and heat, leading to innovative technologies such as acoustic cloaking, thermoelectrics and thermocrystals. These advancements hold promise for reducing energy consumption, environmental noise and transforming waste heat into electricity.
Professor Alexander Balandin receives MRS Medal for his groundbreaking work on graphene's thermal properties and development of a new materials characterization technique. His discoveries have led to major advances in understanding phonon transport and the application of graphene in heat removal and thermal management.
University of Toronto researchers have developed a new tool to measure the thermal and vibrational properties of solids, which could lead to more efficient electronic devices. The tool allows for a clearer picture of how an electronic device's ability to dissipate heat shrinks with its size.
Researchers at MIT have developed a novel method to manipulate heat by employing engineered materials with nanostructured semiconductor alloy crystals. This approach enables the concentration of heat phonons within a specific frequency range, allowing for control over heat flow similar to light waves.
A new study reveals that heat can travel like waves, not particles, through superlattices, allowing for precise control over heat flow. This discovery opens the possibility of creating materials with tailored thermal properties for thermoelectric devices and improved cooling of electronic chips.
Chinese researchers develop a method to solve the specific heat-phonon spectrum inversion problem, enabling the calculation of thermodynamic functions from heat capacity data. They successfully apply this approach to the negative thermal expansion material ZrW2O8, obtaining consistent results with laws of thermodynamics.
Physicists have devised a new method to handle vibrations' effect on electron transport, improving qubit information transfer. The model simulates closer control over phonons and electrons, enabling stronger coupling regimes.
Scientists isolate thermoelectric effect in magnetic materials, enabling control of spin information via heat flow. The discovery provides opportunities to study electron-magnon interactions and may aid energy conversion applications.
A Columbia University engineering team has discovered how pure graphene breaks under tensile stress, revealing a novel soft-mode phonon instability that leads to mechanical failure. This finding is significant for understanding the behavior of low-dimensional systems like graphene and could lead to new ways to engineer its properties.
Researchers at Caltech have developed a new type of material made out of silicon that could lead to more efficient thermoelectric devices. The material is composed of a thin film with a grid-like arrangement of tiny holes, which slows down phonons and lowers its thermal conductivity.
Researchers have made significant breakthroughs in developing practical phonon lasers, which could enable new medical imaging devices and precision measurement tools. Two separate teams, one in the US and the UK, have reported advancements in phonon laser development, using different approaches to overcome technical challenges.
University of Oregon physicists have developed a technique to slow down mechanical fluctuations in optomechanical oscillators, reducing phonon excitations to near 40 quanta. The goal is to reach the quantum mechanical ground state with minimal excitation, enabling precise nanotechnology measurements.
Researchers at Los Alamos National Laboratory have proposed a new explanation for superconductivity that doesn't rely on phonons. By introducing quantum fluctuations and pressure changes, they observed a quantum critical point where electrons pair up in a previously undescribed state of matter.
Scientists have found that certain nanostructures are more susceptible to failure by fracture at specific sizes. This is due to phonon confinement, which affects thermal transport and electronic processes. The study provides valuable information for designing stable nanostructures with reduced fracture energy.
Scientists at Berkeley Lab have discovered an unexpected gap-like feature in graphene's energy spectrum, attributed to phonon interactions. This finding opens new possibilities for graphene nanodevices and applications.
Researchers propose new mechanism for superconductivity in materials without phonon interaction, potentially leading to higher temperatures. This discovery could pave the way for a new class of high-temperature superconductors.
A team of researchers at Duke University has successfully transferred encoded information from a laser beam to sound waves and back again, opening the door for ultra-fast optical communications networks. The new method uses stimulated Brillouin scattering to create acoustic vibrations that can retain data for brief intervals.
Researchers found that pressure and oxygen isotopes have a similar effect on electronic properties of high-temperature superconductors, with vibrations in the lattice structure playing a crucial role in their superconductivity. The study reveals new insights into the behavior of these mysterious materials.
Researchers create near-field infrared microscope to visualize crystal vibrations in the nanometre range. The technique uses infrared light to enhance signal intensity at the tip of a scanning probe needle, revealing phonon resonance in silicon carbide crystals 200-fold brighter than gold.