Soft Optical Shape-Sensing Sheets

“In physical therapy, you often need to gather patient data on how they are moving and stretching their arm during rehabilitation. Surface shape sensing could be very useful in that way,” says graduate student Qifan Yu.
Image Credit: Courtesy of the researchers; edited by MIT News
(CC BY-NC-ND 3.0)

Scientific Frontline: Extended "At a Glance" Summary: Soft Optical Shape-Sensing Sheet

The Core Concept: The shape-sensing sheet is a flexible, stretchable silicone material embedded with soft optical fibers that digitally reconstructs its own three-dimensional form in real time as it bends and twists.

Key Distinction/Mechanism: Unlike traditional motion-capture garments that rely on rigid sensors, this technology utilizes a zig-zag network of flexible, clear rubber optical fibers with intentionally roughened sides. As the sheet moves, light scattering within the fibers changes depending on the bend angle, and a specialized algorithm translates these light variations into an accurate, continuous 3D digital model of the surface.

Origin/History: The technology was developed by mechanical engineers at the Massachusetts Institute of Technology and detailed in a study published in the journal Advanced Intelligent Systems in October 2026.

Major Frameworks/Components:

• Soft Optical Waveguides: Flexible, rubber-based optical fibers featuring a roughened edge that act as bidirectional shape sensors by altering light transmission during deformation.
• Optoelectronic Integration: The utilization of LEDs and light sensors to continuously measure optical output, paired with external circuit boards for signal collection.
• Algorithmic 3D Reconstruction: A computational framework that processes real-time light scattering data to accurately recreate the physical sheet's exact spatial orientation and curvature.

Photonic Chips Expand With Heterogeneous Integration

This image visualizes the design of a heterogeneous integrated photonic chip incorporating various functional single-crystalline nanomembranes. These ultrathin layers add capabilities that the underlying chip materials alone cannot provide. Researchers at WashU have developed a new framework to expand the materials, functions and designs on a single chip, opening new possibilities for faster, more powerful and multifunctional photonic technologies.
Image Credit: AI generated, courtesy of Bae lab

Scientific Frontline: Extended "At a Glance" Summary: Heterogeneous Photonic Integration

The Core Concept: A manufacturing framework that integrates diverse functional materials onto single photonic chips by transferring ultrathin, single-crystalline nanomembranes onto prefabricated optical circuits.

Key Distinction/Mechanism: Unlike conventional chips that use electrons to deliver signals, photonic chips use photons, enabling faster optical links. This specific method avoids the constraints of growing materials directly on silicon by instead building separate high-quality crystals and placing them as ultrathin films ("photonic Legos") onto existing photonic circuits.

Major Frameworks/Components:

• Barium titanate (BTO) nanomembranes for electro-optic modulation.
• Cobalt ferrite (CFO) nanomembranes for nonreciprocal light control.
• Gallium arsenide and gallium nitride membranes integrated laterally on silicon nitride for wide-spectrum light detection (ultraviolet to near-infrared).
• Stacked barium titanate and cobalt ferrite on silicon micro-ring resonators to combine electro-optic and magneto-optic functions.

Graphene Sensors Monitor Stroke Damage

Graphene sensors recorded damaging electrical waves after a stroke in unprecedented detail, revealing whether brain tissue was healthy, vulnerable, or severely compromised.
Photo Credit: Courtesy of University of Manchester

Scientific Frontline: Extended "At a Glance" Summary: Graphene-Based Brain Sensors for Stroke Monitoring

The Core Concept: Graphene-based microtransistor sensors are highly sensitive neurological devices capable of recording ultraslow electrical signals to assess brain tissue viability in real time after an ischemic stroke.

Key Distinction/Mechanism: Unlike existing technologies that fail to capture slow electrical changes, these sensors precisely measure cortical spreading depolarizations to distinguish between healthy, vulnerable, and severely compromised brain tissue.

Major Frameworks/Components:

• Cortical Spreading Depolarizations: Waves of disrupted electrical activity that travel through injured brain tissue following an initial ischemic event.
• Hemodynamic Prediction: The ability to determine whether regional blood flow will increase to aid recovery or decrease to worsen the injury in response to electrical waves.
• Pharmacological Intervention: The application of ketamine to reduce the duration of damaging electrical waves, shift the blood flow response toward vasodilation, and minimize the overall area of neurodegeneration in murine models (Mus musculus).

Vanillin in Chronic Wound Healing

Photo Credit: Diana Polekhina

Scientific Frontline: Extended "At a Glance" Summary: Vanillin-Based Therapeutics for Wound Healing

The Core Concept: Vanillin, the primary organic compound extracted from natural vanilla pods or synthesized from clove oil and rice, is being repurposed as a functional bioactive molecule to formulate treatments for chronic wounds.

Key Distinction/Mechanism: Due to its amphiphilic molecular structure, vanillin natively interacts with reactive oxygen species, cellular membranes, and polymeric matrices, operating simultaneously as a dynamic crosslinker and a potent antioxidant, anti-inflammatory, and antibacterial agent.

Major Frameworks/Components:

• Food-to-Function Translation: The systematic transition of chemically stable, safe-for-consumption sensory additives into clinically deployable medical therapeutics.
• Polymeric Matrix Integration: The incorporation of vanillin into nanomaterials and biomedical coatings to support targeted drug delivery, particularly for complex hydrophobic compounds.
• Industrial Scalability: The utilization of abundant, low-cost synthetic small molecules to ensure supply chain robustness, commercial viability, and formulation reproducibility.

Magnetic Liquid Crystal State in Rare Earth Compound

Top left: Yaofeng Xie. Credit: Yaofeng Xie. Top right: Sijie Xu. Credit: Sijie Xu. Bottom: Pengcheng Dai.
Photo Credit: Rice University/Jeff Fitlow.

Scientific Frontline: Extended "At a Glance" Summary: Magnetic Liquid Crystal State in \(\ce{YbMnBi2}\)

The Core Concept: Ytterbium manganese dibismuthide (\(\ce{YbMnBi2}\)) is a rare-earth compound that exhibits a unique state when heated above its magnetic ordering temperature, wherein its magnetic spins lose strict organization but continue to fluctuate in preferred directions.

Key Distinction/Mechanism: In conventional magnets, spins become completely random when heated past the magnetic ordering temperature. In \(\ce{YbMnBi2}\), the fluctuating spins maintain a directional preference, behaving analogously to a liquid crystal. Furthermore, neutron measurements confirm its spins are collinear rather than canted, demonstrating that its unusually large anomalous Hall effect is driven by interactions between ytterbium magnetic moments and manganese spin fluctuations.

Major Frameworks/Components:

• Ytterbium manganese dibismuthide (\(\ce{YbMnBi2}\)): The specific rare-earth material required to stabilize this phenomenon.
• Anomalous Hall effect: A condition where a sideways voltage remains across a material even in the absence of an external magnetic field.
• Collinear spins: The magnetic spins in the material align in straight lines, ruling out earlier hypotheses of a Weyl state.
• Spin interactions: The essential interplay between the inherent magnetic moments of ytterbium ions and the directional fluctuations of manganese spins.

Sustainable Magnesium Metal Alloys From Waste Eggshells

Photo Credit: Bharat Gwalani.

Scientific Frontline: Extended "At a Glance" Summary: Magnesium-Eggshell Composites

The Core Concept: A sustainable manufacturing technique that utilizes powdered eggshells—a biogenic waste material—as a calcium source to produce high-quality, lightweight magnesium alloys.

Key Distinction/Mechanism: Rather than relying on the energy-intensive processing of mined calcium ore, this method employs friction stir extrusion. A spinning steel mandrel drives finely ground eggshells into a magnesium block; the resulting intense shear deformation and frictional heat convert the calcium carbonate (\(CaCO_{3}\)) into calcium oxide (\(CaO\)) and nascent calcium to form the high-strength \(Mg_{2}Ca\) alloy.

Major Frameworks/Components:

• Friction-based solid-state extrusion creating a dynamic thermo-mechano-chemical environment.
• In-situ decomposition and nanoscale fragmentation of \(CaCO_{3}\) particles.
• Interfacial reactions forming \(CaO\) and \(MgO\) to create reaction-driven bonding between the reinforcement and matrix.
• Extensive dynamic recrystallization within the magnesium matrix to refine the grain structure.

Zinc Oxide Quantum Dots Advance Quantum Computing

(a) The structure of the gate electrodes on the ZnO device used in the experiment in this paper. (b) The charge stability diagram indicating the formation of ZnO double quantum dot in few-electron regime.
 Image Credit: ©Kosuke Noro et al.

Scientific Frontline: Extended "At a Glance" Summary: Zinc Oxide Quantum Dots

The Core Concept: Researchers have successfully demonstrated charge sensing and the formation of a few-electron double quantum dot within a zinc oxide device, advancing the viability of this material for scalable semiconductor quantum computing.

Key Distinction/Mechanism: Unlike traditional silicon or gallium arsenide materials, zinc oxide offers a low nuclear spin environment that better preserves electron spin states and features a direct bandgap for potential optical coupling. The research team achieved rapid detection of electron charge states by pairing a sensor quantum dot with a radio-frequency resonant circuit.

Major Frameworks/Components:

• Semiconductor Quantum Dots: Nanoscale structures that confine individual electrons to utilize their spins for storing quantum information.
• Spin Qubits: The fundamental units of quantum data that rely on the spin state of confined electrons.
• High-Frequency Reflectometry: A measurement technique utilizing radio-frequency resonant circuits to achieve high-speed evaluation and rapid readout of quantum states.
• Sensor Quantum Dot Electrometry: The integration of an adjacent sensor quantum dot to act as an electrometer, detecting minute changes in the charge state of the target dots.

Flexible Porous Material Improves Solid-State Battery Tech

From left to right, Sibani Lisa Biswal, Zina Deriche and Stavroula Alina Kampouri.
Photo Credit: Courtesy of Rice University

Scientific Frontline: Extended "At a Glance" Summary: ZnBTCA Metal-Organic Framework

The Core Concept: ZnBTCA is a relatively soft, flexible metal-organic framework (MOF) designed to selectively transport lithium ions within solid-state batteries.

Key Distinction/Mechanism: Unlike many MOF electrolytes built from rigid aromatic linkers, ZnBTCA utilizes a flexible aliphatic linker with a carbon-chain backbone, making the framework mechanically adaptable while its negatively charged structure promotes the efficient movement of positively charged lithium ions.

Major Frameworks/Components:

• Metal-Organic Framework (MOF): A porous crystalline material constructed from metal atoms (zinc) connected by organic molecules.
• Aliphatic Linker: A flexible molecular building block that provides the material's mechanical softness.
• Solid Electrolyte Membrane: The material is incorporated into a membrane to replace flammable liquid electrolytes.

Power-Generating Wallpaper Converts Indoor Moisture

A Binghamton University professor and his students have designed a new wallpaper that takes moisture from the air and generates electricity.
Image Credit: Courtesy of Binghamton University

Scientific Frontline: Extended "At a Glance" Summary: Power-Generating Wallpaper

The Core Concept: A novel wallpaper technology that absorbs moisture from indoor air and converts it into small amounts of electric current.

Key Distinction/Mechanism: Unlike previous moist-electric generators (MEGs) designed for outdoor use, this system is optimized for stable indoor environments. It uses a microchip-like architecture on paper, where glycerol captures moisture at the edges and a raised polyvinylpyrrolidone (PVP) structure controls evaporation in the center. This creates an ion-concentration gradient that separates charges and generates voltage, with all wiring hidden on the back for aesthetics.

Major Frameworks/Components:

• Moist-electric generators (MEGs)
• Ion-concentration gradients
• Charge separation
• Papertronics
• Hygroscopic and ionizable materials

Novel MOF Photocatalyst for Green Hydrogen

Researchers at Oregon State University have developed a new family of materials that use light to produce hydrogen from water, opening the door to new ways of converting the sun’s rays into clean energy. A collaboration led by Kyriakos Stylianou of the OSU College of Science created a photocatalyst that enables the high-speed, high-efficiency production of hydrogen, used in fuel cells for cars as well as in the manufacture of many chemicals including ammonia, in the refining of metals and in making plastics.
Image Credit: Courtesy of the researchers and Oregon State University

Scientific Frontline: Extended "At a Glance" Summary: BVR-19 Photocatalyst for Green Hydrogen Production

The Core Concept: Researchers have developed a novel metal-organic framework (MOF) photocatalyst that harnesses sunlight to efficiently split water and produce clean hydrogen gas.

Key Distinction/Mechanism: Unlike conventional photocatalysts that rely on expensive metal atoms or electricity-driven electrocatalysis, this material utilizes its organic building blocks—specifically a sulfide-to-sulfide bond that undergoes transient cleavage upon light exposure—to move electrons and drive hydrogen production.

Origin/History: The material, designated BVR-19, was developed by Kyriakos Stylianou and researchers at the Oregon State University Materials Discovery Laboratory, with findings published in the Journal of the American Chemical Society.

Green Zirconium and Hafnium Separation

Image Credit: Courtesy of the researchers

Scientific Frontline: Extended "At a Glance" Summary: Eco-Friendly Zirconium and Hafnium Separation

The Core Concept: Researchers at Oregon State University have developed a low-energy, water-based precipitation process to separate zirconium from hafnium, replacing the highly toxic and energy-intensive organic solvents traditionally used by the industry.

Key Distinction/Mechanism: Traditional liquid-liquid extraction relies on millions of pounds of flammable solvents and releases significant atmospheric pollution. The new method utilizes an aqueous solution containing thiocyanate ligands and choline to drive precipitation. Dissolved ions with opposite charges attract to form an insoluble, hafnium-rich solid, achieving an unprecedented separation factor of 33, compared to the industry standard of 6 to 7.

Major Frameworks/Components:

• Aqueous Precipitation: A water-based separation process where dissolved, oppositely charged ions attract to form an insoluble solid out of a solution.
• Thiocyanate Ligands: Chemical binding agents that specifically attach to the dissolved hafnium and zirconium ions.
• Choline: An inexpensive, nontoxic chemical typically used as a food additive, deployed in this process to facilitate precipitation without the need for flammable organic solvents.
• Separation Factor Optimization: A quantifiable measurement of a process's ability to separate two components in a mixture, improved here from a maximum baseline of 7 up to 33.

Bioresorbable Batteries for Ingestible Devices

Caption: The researchers designed two different versions of the battery that could be used for different applications — a disc 7.5 millimeters in diameter, and a rectangular bar 24 millimeters long.
Image Credit: Courtesy of the researchers
(CC BY-NC-ND 3.0)

Scientific Frontline: Extended "At a Glance" Summary: Bioresorbable Batteries

The Core Concept: Bioresorbable batteries are miniature, ingestible power sources constructed from biocompatible materials designed to operate electronic devices within the human body before safely dissolving. They generate necessary electrical currents within the gastrointestinal tract and are fully absorbed or excreted without causing heavy metal toxicity.

Key Distinction/Mechanism: Traditional ingestible electronics rely on lithium or silver oxide coin batteries, which pose severe internal risks if their protective casings fail. In contrast, bioresorbable batteries generate 1.84 volts using digestible metals and an ionic liquid gel electrolyte, functioning normally in gastric acid for three days before gradually degrading over several weeks.

Major Frameworks/Components:

• Anode and Cathode Setup: The battery utilizes magnesium for the anode and molybdenum trioxide for the cathode, both of which are safe for human consumption in trace amounts.
• Electrolyte Integration: The system employs an ionic liquid gel electrolyte to facilitate the flow of electrical charge.
• Structural Form Factors: The batteries were developed in two primary configurations: a 7.5-millimeter diameter disc and a 24-millimeter rectangular bar.
• Biological Interfacing: The technology demonstrates the capacity to stimulate gastric endocrine cells, increasing the production of ghrelin by approximately 50 percent during a 20-minute stimulation cycle.
• Telemetry Integration: The power source interfaces with bioresorbable RFID tags composed of molybdenum and cellulose, enabling continuous communication ranges up to 1.5 meters.

Rigid Thin Film Achieves Extreme Thermal Insulation

Artist Illustration
Image Credit: Courtesy of North Carolina State University

Scientific Frontline: Extended "At a Glance" Summary: Extreme Thermal Insulator

The Core Concept: Researchers have developed an azobenzene ethyl ammonium lead iodine thin film that functions as an extreme thermal insulator while maintaining high mechanical stiffness.

Key Distinction/Mechanism: Unlike typical stiff materials that conduct heat well, or traditional insulators (like foams and aerogels) that lack rigidity, this material combines an ultralow thermal conductivity (~0.04 W m-1 K-1 at room temperature) with an elastic modulus of 7.7 gigapascals, making it 700 to 10,000 times stiffer than silicone and five times better at insulating.

Major Frameworks/Components:

• The material is a two-dimensional hybrid organic-inorganic perovskite.
• It utilizes a spun-cast layered structure consisting of alternating organic and inorganic layers.
• The unique properties are achieved through molecular engineering by replacing carbon-carbon chains in the organic layers with a tailored combination of benzene rings.

Renewable Lignin-Based Carbon Fiber Production

Closeup of microscopic “rebar” that adds strength to carbon fiber. This extra strength is incorporated into the material via functionalized single-walled carbon nanotubes. The manufacturing process was developed by WashU engineers to make use of waste material lignin and further strengthen carbon fiber used in automotive and energy industries.
Image Credit: Yuan lab

Scientific Frontline: Extended "At a Glance" Summary: Renewable Carbon Fiber Production

The Core Concept: A novel manufacturing method that produces high-quality, renewable carbon fiber by blending synthetic polyacrylonitrile (PAN) with lignin, an abundant natural waste biomaterial.

Key Distinction/Mechanism: Unlike traditional manufacturing that relies entirely on expensive, petroleum-derived PAN, this process incorporates single-walled carbon nanotubes into the polymer matrix. These nanotubes act as structural "rebar" to align the crystallization chemistry, maximizing the mechanical properties of the fiber.

Major Frameworks/Components:

• Lignin Integration: Utilizing lignin—the earth's second most abundant natural biomaterial and a byproduct of paper pulping and biorefining industries—to replace up to 50% of the synthetic PAN.
• Nanotube Templating: Deploying single-walled carbon nanotubes to create a highly oriented crystalline structure within the lignin-PAN precursor solution.
• Wet-Spinning and Heat Treatment: Extruding the precursor solution via a tension-assisted wet-spinning process, followed by an optimized carbonization phase to fully strengthen the resulting fiber.

Sonochemical Synthesis of Iron Oxide Nanoparticles

Ultrasound-driven direct conversion of iron powder in water into spinel-type iron oxide nanoparticles.
 Image Credit: ©Yamato Hayashi et al.

Scientific Frontline: Extended "At a Glance" Summary: Reagent-Free Sonochemical Synthesis of Iron Oxide Nanoparticles

The Core Concept: A novel, reagent-free synthesis route utilizing ultrasound to convert solid iron powder and water directly into spinel-type iron oxide nanoparticles.

Key Distinction/Mechanism: Unlike conventional synthesis methods requiring soluble iron salts and precipitation agents like ammonia or sodium hydroxide, this process relies on acoustic cavitation—the formation and collapse of microscopic bubbles under ultrasound—to break apart the iron surface and drive the chemical reaction.

Major Frameworks/Components:

• Acoustic cavitation (microjets, shock waves, localized high temperature/pressure).
• Direct solid-liquid transformation from metal to oxide.
• Sonochemical synthesis at 23 or 43 kHz frequencies.

Brain-Inspired Nanoscale Mechanics for Energy-Efficient Computing

This illustration shows the nano-mechanical devices the researchers developed. Inspired by neurons, they can perform computing tasks with high energy efficiency.
Image Credit: Emily Theobald
(CC BY-NC-ND 3.0)

Scientific Frontline: Extended "At a Glance" Summary: Brain-Inspired Nanoscale Mechanics

The Core Concept: A new nanoscale computing platform uses the unique mechanical responses of soft polymers to perform functions like computing and memory in a single device, mimicking the behavior of biological neurons.

Key Distinction/Mechanism: Unlike conventional computing that separates processing and memory, this platform uses a super-thin film of a viscoelastic soft polymer (PDMS) sandwiched between two metal electrodes; as voltage is applied, the polymer compresses and "remembers" the applied force, accumulating charge until it fires like a biological neuron before returning to its original state.

Major Frameworks/Components:

• Bioinspired Computation: Modeled after biological systems (like the distributed nervous system of an octopus) that process information locally through physical changes without needing a central controller.
• Nanoscale Mechanical Computing: Executing calculations through physical transformations, such as movement and compression, at the nanometer scale.
• Viscoelastic Polydimethylsiloxane (PDMS): A soft polymer used as a "nano-spring" to balance adhesive forces between metal surfaces, allowing for controlled and reversible nanomechanical reconfiguration.

Reactive Carbon Capture via Deep Eutectic Solvents

Southwest Research Institute is leading an internally funded research project to evaluate an emerging method for reactive carbon capture, with the goal of reducing the steps involved in transforming carbon waste into useful industrial chemicals. The method uses deep eutectic solvents (DESs) that form a liquid at room temperature from two solids, taking advantage of the unique bonding properties of hydrogen molecules.
Photo Credit: Southwest Research Institute

Scientific Frontline: Extended "At a Glance" Summary: Reactive Carbon Capture via Deep Eutectic Solvents

The Core Concept: Reactive carbon capture utilizing deep eutectic solvents (DESs) is an emerging process designed to efficiently capture carbon waste and transform it into valuable commodity chemicals.

Key Distinction/Mechanism: To create a DES, a hydrogen-bond-accepting salt is mixed with a solid organic compound, such as urea or glycerol. This initiates hydrogen bonding, converting the solids into a room-temperature liquid. The highly tunable solvent captures carbon, which is then separated and reconfigured into useful byproducts via electrochemical reactions. This method functions as a green alternative, eliminating flammability hazards and minimizing the toxicity associated with traditional industrial solvents.

Origin/History: While DES applications for carbon capture were historically limited to academic research using pure carbon dioxide, Southwest Research Institute (SwRI) began bench-scale testing under real-world industrial conditions (accounting for chemical impurities) during fiscal year 2025.

Major Frameworks/Components:

• Deep Eutectic Solvents (DESs): Tunable fluid mixtures with lower melting points than their individual precursors.
• Hydrogen Bonding: The intermolecular attraction linking the chemical precursors to transition them from solid to liquid states.
• Electrochemical Pathways: The specific electrical and chemical reactions utilized to separate captured carbon into new configurations.

Quantum Sensors for GPS-Denied Navigation

Sandia National Laboratories scientist Jongmin Lee adjusts a machine that produces optical nanofibers 200 times thinner than a human hair. When laser beams travel through the nanofiber, halos of light form very close to it, guiding atoms along its length for quantum sensing.
Photo Credit: Craig Fritz

Scientific Frontline: Extended "At a Glance" Summary: Chip-Scale Quantum Inertial Sensors

The Core Concept: A quantum sensor, specifically a guided atom interferometer, designed to be small and rugged enough for field use on a specialized microchip called a photonic integrated circuit.

Key Distinction/Mechanism: Unlike free-space atom interferometers that drop atoms through a vacuum and can lose them during strong jolts, this guided atom interferometer uses tiny halos of light on a nanofiber (and eventually a membrane-waveguide) to hold onto and guide atoms, keeping them in constant view of the lasers even during turbulence or vibrations.

Major Frameworks/Components:

• Atom Interferometer: A quantum mechanical device used for making precise measurements of motion.
• Optical Nanofibers: Ultrathin optical fibers (420 nanometers in diameter) used as a testbed to guide cesium atoms using halos of light.
• Membrane-Waveguide: A next-generation, heat-resistant component anchored by silicon pins acting as heat sinks, solving the problem of lasers overheating and cracking the atom guide in a vacuum.
• Photonic Integrated Circuit: A specialized microchip that will eventually house the guided atom interferometer for field use.

White Graphene Nanopores Shaped at the Atomic Scale

A simulated microscopy image of hexagonal boron nitride with a circular pore surrounded by triangular ones. Darker circles correspond to individual boron and brighter circles to nitrogen atoms.
Image Credit: © Umair Javed

Scientific Frontline: Extended "At a Glance" Summary: Nanopore Engineering in White Graphene

The Core Concept: A novel technique for precisely controlling the shape of nanopores—holes only a few atoms wide—in hexagonal boron nitride (hBN), a two-dimensional material also known as "white graphene."

Key Distinction/Mechanism: Instead of pore shape being determined solely by electron beam irradiation, it is dictated by the interplay between the electron beam and the surrounding atmosphere. In an ultra-high vacuum, the energetic electrons physically remove boron and nitrogen atoms at similar rates, creating circular pores; however, introducing a small amount of oxygen causes oxygen-mediated chemical etching, which predominantly removes boron atoms and yields triangular pores with nitrogen-terminated edges.

Origin/History: For nearly two decades, scientists believed that electron irradiation of hBN invariably produced triangular pores due to inherent differences in the atomic displacement rates of boron and nitrogen. The University of Vienna team, led by Jani Kotakoski, disproved this in September 2026 by demonstrating the atmospheric influence using a microscope with an exceptionally high vacuum.

Major Frameworks/Components:

• Hexagonal Boron Nitride (hBN): An electrically insulating 2D material acting as the substrate.
• Transmission Electron Microscopy (TEM): Utilized both to image the material down to individual atoms and to supply the energetic electrons that knock atoms out of the lattice.
• Physical Drilling vs. Chemical Etching: The core competing mechanisms where the electron beam provides the physical force and the introduced oxygen, split into reactive species by the beam, provides the chemical attack.

Controlling Chiral Phonons With Electricity

The collective vibrations of atoms in a crystal are known as phonons. In chiral phonons, these vibrations include a rotational motion, giving them a left- or right-handed character. Researchers have now shown that this handedness can be switched using an electric field.
Image Credit:© Paul Scherrer Institute / Mahir Dzambegovic and Monika Bletry

Scientific Frontline: Extended "At a Glance" Summary: Chiral Phonons

The Core Concept: Chiral phonons are collective, rotational atomic vibrations within a crystal lattice that exhibit distinct left-handed or right-handed characteristics.

Key Distinction/Mechanism: Unlike standard lattice vibrations, chiral phonons carry angular momentum. Their inherent handedness can be reliably reversed and maintained at room temperature by applying a low-voltage electrical field to a ferroelectric material.

Origin/History: Scientists at the Paul Scherrer Institute first experimentally proved the existence of chiral phonons in quartz in 2023. In September 2026, researchers successfully demonstrated the ability to control this handedness using thin membranes of \(BaTiO_3\).

Major Frameworks/Components:

• Ferroelectricity: Materials possessing an intrinsic electrical polarization that can be flipped using an applied electric field, allowing for the reversal of phonon chirality.
• Resonant Inelastic X-ray Scattering (RIXS): An advanced technique utilizing circularly polarized X-rays at a synchrotron facility to observe the transfer of angular momentum and resolve phonon handedness.
• Angular Momentum Coupling: The fundamental interaction linking the rotational motion of chiral phonons with magnetism through the spin and orbital dynamics of electrons.