Ghimire synthesizing topological materials
Assistant Professor Nirmal Ghimire is working to synthesize and characterize topological materials. He received $48,910 in US Department of Energy funding for this research.
Topology
Articles tagged with Topology
Topological photonics in fractal lattices
Researchers created a photonic Floquet topological insulator in a periodically driven fractal lattice, exhibiting topological edge states with real-space Chern number 1. The simulations show wavepackets can propagate along the outer and inner edges without penetration or backscattering.
Synthetic dimensions enable a new way to construct higher-order topological insulators
Researchers propose a new method for constructing higher-order topological insulators using ring resonators and synthetic dimensions, enabling dynamic control over system parameters. This approach allows for the creation of high-dimensional topological insulators with exotic properties.
Cherned up to the maximum
Researchers have observed that palladium gallium (PdGa) reaches the maximum allowed Chern number of four, a fundamental aspect yet to be settled in topological physics. The team also demonstrated control over the sign of the Chern number by manipulating the crystal's handedness during growth.
On-chip spin-Hall nanograting for simultaneously detecting phase and polarization singularities
Researchers developed an on-chip plasmonic spin-Hall nanograting to detect both phase and polarization singularities of incident beams. The structure directionally couples different positions depending on the polarization and topological charge of the beam, enabling rapid detection with high resolution.
Low-threshold topological nanolasers based on the second-order corner state
A team of scientists demonstrates a low-threshold topological nanolaser in a 2D topological photonic crystal nanocavity, achieving high performance comparable to conventional semiconductor lasers. The design features a second-order corner state that provides robustness against defects and enhances light-matter interaction.
Quantum physics: Realization of an anomalous Floquet topological system
Researchers create genuine time-dependent topological system using ultracold atoms in periodically-driven optical honeycomb lattices, exhibiting unique electronic properties and chiral edge modes. The system's non-trivial topological properties are rooted in the non-trivial winding of its quasienergy spectrum.
Lose weight of fusion reactor component
A team of researchers successfully applied topology optimization to a fusion reactor component, reducing its weight by 25%, while maintaining its strength. The superconducting coil requires a strong magnetic field and support structure to function, but this structure is extremely heavy, weighing 20 times that of the Large Helical Device.
Pattern analysis of phylogenetic trees could reveal connections between evolution, ecology
Researchers studied patterns in phylogenetic trees to understand how evolution and ecology interact. They found that ecological processes create a fractal structure in tree topology, leading to unbalanced branching.
A fresh twist in chiral topology
Researchers at Max Planck Institute for Chemical Physics of Solids successfully realized chiral topological compound PtGa, exhibiting a high topological charge of 4. This property enables the generation of a large quantized photogalvanic current that can be manipulated by incident light polarization.
Quantum material research facilitates discovery of better materials that benefit our society
A joint research team from Hong Kong, Beijing, and Shanghai discovered a rare-earth magnet TmMgGaO4 (TMGO) that realizes the long-sought-after two-dimensional topological Kosterlitz-Thouless (KT) phase. The breakthrough provides the missing piece of KT phenomena in bulk magnetic materials.
Three research groups, two kinds of electronic properties, one material
Scientists from three research groups collaborate to study a unique compound that conducts electrons in different ways on its surfaces and doesn't conduct at all in its middle. They find evidence of strong and weak topological insulation properties, challenging current understanding of the material's behavior.
First confirmation of new theory by metamaterial
Physicists at the University of Würzburg have experimentally confirmed a new theory on topological metamaterials, which exhibit extraordinary properties. The study shows that all states localize at the edge of the material, a phenomenon known as the non-Hermitian skin effect.
Viewing the topology of thermonuclear reaction in nuclear landscape from the network perspective
Scientists used complex network theory to analyze nuclear reaction networks, identifying stable nuclides and patterns in thermonuclear reactions. The study revealed that certain reaction patterns fade away or change shape as the number of protons reaches a certain threshold.
Boosting energy efficiency of 2D material electronics using topological semimetal
A research team from Singapore University of Technology and Design has discovered a new strategy to resolve contact resistance in 2D semiconductor devices. They found that an ultrathin film of Na3Bi can be used as a metal contact with low contact resistance, retaining the intrinsic electronic properties of 2D semiconductors.
Discoveries of high-Chern-number and high-temperature Chern insulator states
Researchers have discovered high-Chern-number and high-temperature Chern insulator states in MnBi2Te4 devices, exhibiting multiple dissipationless edge states above liquid helium temperature. Theoretical calculations reveal the origin of these states as a magnetic Weyl semimetal with layer-dependent Chern number.
Topology sheds new light on synchronization in higher-order networks
Researchers propose a novel 'higher-order' Kuramoto model combining topology with dynamical systems to characterize synchronization in higher-order networks. The study found that higher-order synchronization occurs explosively, revealing how topology induces dramatic changes in dynamics at the onset of synchronization transition.
NUI Galway mathematician publishes article in world's top mathematics journal
Dr Martin Kerin, an Irish mathematician from NUI Galway, has published a research article in the Annals of Mathematics, resolving a question on the geometry of seven-dimensional exotic spheres. The discovery confirms that all these spaces admit non-negative curvature.
Novel insight reveals topological tangle in unexpected corner of the universe
Researchers found a Hopfion structure, a repeating pattern present throughout nature, in ferroelectric nanoparticles. This discovery highlights the interconnectedness of scientific fields and could lead to breakthroughs in energy storage devices and information systems.
Lossless conduction at the edges
Scientists analyzed tiny tungsten ditelluride crystals and detected characteristic oscillations indicating current flows along narrow edges, supporting theoretical predictions of higher-order topological material properties.
When predictions of theoretical chemists become reality
Researchers have successfully synthesized a 2D honeycomb kagome polymer, revealing predicted topological properties and opening up new possibilities for electronic devices. The material's unique structure combines the properties of graphene and superconductors.
4D electric circuit network with topology
Scientists have developed a 4D electric circuit network that simulates a topological insulator, exhibiting unusual properties such as quantized Hall currents and surface excitations. The work paves the way for studying topological phase transitions, non-linear effects, and quantum open systems.
Quantum Hall effect 'reincarnated' in 3D topological materials
Researchers have found a link between 2D and 3D phases of topological matter, reviving the quantum Hall effect in 3D superconductors. This connection could enable fault-tolerant quantum computing using entangled states protected by long-range quantum entanglement.
New Princeton study takes superconductivity to the edge
Researchers detect a superconducting current along the exterior edge of a topological semi-metal, suggesting ways to unlock 'topological superconductivity' for quantum computing. The discovery uses a crystalline material called molybdenum ditelluride and measures the critical current as it varies with magnetic field.
Quantum research unifies two ideas offering an alternative route to topological superconductivity
Scientists at University of Copenhagen have discovered a new way to create topological superconductivity and Majorana zero modes using a cylindrical superconductor surrounding a semiconductor, potentially offering an alternative route for qubits. This breakthrough unifies two existing ideas in quantum mechanics.
New discovery helps close the gap towards optically controlled quantum computation
Researchers have made a breakthrough discovery that could help establish optically controlled quantum computation by using light to steer quantum states in a Dirac semimetal. This new mechanism enables the creation of topological transistors and quantum computing devices with high speed and low energy consumption.
Questionable stability of dissipative topological models for classical and quantum systems
Researchers Rebekka Koch and Jan Carl Budich study non-Hermitian Hamiltonians in classical and quantum systems, revealing their impact on dissipative topological models. They found stable spectral instabilities under physically motivated perturbations.
UTA computer scientist developing topological methods for robotic perception
William Beksi, a UTA computer scientist, is developing topological methods to process large-scale 3D point cloud data, aiming to overcome limitations in robotic perception applications. This new approach uses persistent homology to extract unique insights into the structure of point cloud data.
Researchers reveal new understandings of synthetic gene circuits
Recent discoveries by ASU professors Xiaojun Tian and Xiao Wang explore the impact of memory circuit topologies on host cell behavior, revealing a first in the field of synthetic biology. The research expands scientific understanding of complex interactions between engineered gene circuits and biological host cells.
A twist connecting magnetism and electronic-band topology
A comprehensive study reveals that spin canting, a slight nudge on magnetic moments, provokes substantial changes in the electronic band structure of CaMnBi2. The research establishes a direct link between magnetism and electronic-band topology, opening doors to exploring new properties and possibilities.
A funnel of light
Researchers at the University of Würzburg have discovered a new quantum state of matter that enables light to be accumulated at a specific point in an optical fiber. This effect, known as a 'light funnel', has the potential to improve the sensitivity of optical detectors and unlock new technological applications.
Symmetry-enforced three-dimension Dirac phononic crystals
Researchers have created a 3D phononic crystal that hosts symmetry-enforced Dirac points at the Brillouin zone corners. These points exhibit conical dispersion and vanishing density of states around them, making the material an ideal platform for simulating relativistic Dirac physics.
New experimental, theoretical evidence identifies jacutingaite as dual-topology insulator
Researchers have identified jacutingaite as a dual-topological insulator, exhibiting both weak and topological crystalline insulator properties. The material's dual nature is attributed to strong interlayer hybridization leading to a novel hopping term, resulting in protected surface states.
Research reveals collective dynamics of active matter systems
The study describes experiments using a three-dimensional active nematic, revealing dominant loop structures that emerge spontaneously and expand before self-annihilating. These loops differ from defects in two-dimensional systems, having no charge but still related to them.
Topology protects light propagation in photonic crystal
Researchers have successfully observed topologically protected light waves propagating along a special boundary in a photonic crystal, unaffected by sharp corners or imperfections. This breakthrough enables the development of optical chips with enhanced reliability and potential for quantum information transfer.
Argonne's Valerii Vinokur awarded Fritz London Prize
Valerii Vinokur, a senior scientist at Argonne National Laboratory, has made significant contributions to understanding topological properties of matter and their related phase transitions. His research has enabled the discovery of novel superinsulating states of matter in disordered superconducting films.
Observation of non-trivial superconductivity on surface of type II Weyl semimetal TaIrTe4
Researchers have discovered quasi-1D surface superconductivity in TaIrTe4, a type II Weyl semimetal. This finding offers a novel platform for exploring topological superconductors and may contribute to the development of topological quantum computation.
Organic-cation intercalation: An effective strategy for manipulating band topology and superconductivity
A new intercalation strategy boosts superconductivity in layered materials, enabling tailored topological properties. The method, developed by Tsinghua University researchers, shows enhanced superconductivities and good sample stabilities in intercalated MoTe2 and WTe2.
Fragile topology: Two new studies explain the strange electron flow in future materials
Two new studies from Princeton researchers and their collaborators chart a course for restoring conductivity in fragile topology materials. The studies provide a theoretical explanation for the phenomenon, revealing that conducting surface states can reappear under specific conditions.
How to handle fragile states
Researchers at ETH Zurich present theoretical and experimental work that provides a higher-level understanding of 'fragile topology' in topological insulators. The discovery could lead to new applications in acoustics, photonics, and beyond.
Jackiw-Rebbi zero-mode: Realizing non-Abelian braiding in non-Majorana system
Scientists have discovered a new method to realize non-Abelian braiding in a non-Majorana system by constructing Jackiw-Rebbi zero-modes in a quantum spin Hall insulator. This breakthrough has the potential to enable topological quantum computation without superconductivity, offering advantages over Majorana-based systems.
Exotic new topological state discovered in Dirac semimetals
Researchers found that Dirac semimetals exhibit robust, conducting electronic states in 1D, challenging previous conclusions about the nature of these materials. The discovery settles the decades-old problem of whether condensed matter Dirac fermions have topologically protected surface states.
Diabolical points in coupled active cavities with quantum emitters
Researchers from Chinese Academy of Sciences have successfully demonstrated diabolical points (DPs) in two strongly coupled microdisks with embedded quantum dots. The system enables a controllable phase shift between the microdisks, indicating potential applications in directional laser and quantum phase control.
The case of the elusive Majorana: The so-called 'angel particle' is still a mystery
A team of physicists at Penn State and Germany's University of Wurzburg studied over three dozen devices similar to the one used to produce the angel particle. They found that the feature claimed to be the manifestation of the angel particle was unlikely to be induced by its existence.
Color-changing fiber and theory reveal fundamental mystery of knots
Researchers developed an experimental and theoretical analysis to understand how knots work, revealing key topological factors that determine stability. The framework could be used to design new classes of knots with specific behaviors.
Topological semimetals can generate sizable transverse thermoelectric figure of merit
Researchers have discovered a much larger transverse figure of merit in topological semimetals compared to their longitudinal counterparts. This is attributed to the coexistence of electrons and holes contributing additively and high charge mobility without lattice imperfections.
Scientists discover first antiferromagnetic topological quantum material
Researchers have successfully developed the first crystal-growing technique for manganese-bismuth telluride (MnBi2Te4), a new antiferromagnetic topological insulator. The discovery has significant implications for technological advances in information processing, sensors, and computing.
Chen WeiQiu's team realized the tailoring of topological states via boundary selection
Chen WeiQiu's team discovers a way to tailor topological states in acoustic materials by selecting specific boundaries, enabling dual-channel propagation and one-way propagation of sound waves. This breakthrough leads to the design of tunable acoustic devices with new possibilities.
A platform for stable quantum computing, a playground for exotic physics
Researchers discover samarium hexaboride, a material with strongly interacting electrons, which can also exhibit topological insulating properties. This breakthrough paves the way for more stable quantum computing and opens up new possibilities for exotic physics research.
Scientists find new way to identify, manipulate topological metals for spintronics
Researchers have found a new method to identify and manipulate magnetic Weyl semimetals, which could lead to the development of spintronic devices. The new approach uses the relationship between electronic spin and charge to reveal the topological characteristics of these materials.
New spin directions in pyrite an encouraging sign for future spintronics
Researchers have discovered unconventional energy- and direction-dependent spin textures on the surface of pyrite-type crystals, enabling both in-plane and out-of-plane spin components. This finding opens new possibilities for topological spintronics devices and unlocks the potential of pyrite in future spintronics applications.
A new type of acoustic insulation enables sound to be concentrated in corners
Researchers at UC3M have developed a new type of acoustic insulation that can focus sound energy in corners, potentially leading to breakthroughs in filtering and conducting applications. The innovation uses topological materials to concentrate sound waves, enabling efficient energy harvesting and conversion.
Topological nanoelectronics
Physicists at JMU have successfully constructed a Quantum Point Contact (QPC) in topological HgTe quantum wells, allowing them to investigate potential interactions between the edge states. This breakthrough could lead to fundamental discoveries in topological nanostructures and innovative applications for information technology.
World leading mathematicians to solve mysteries at the interface of geometry and topology
A new research center will focus on solving fundamental scientific problems in geometry and topology, with potential applications in fields like forest fires and airbags. The Copenhagen Center for Geometry and Topology aims to answer questions about shortest paths, moduli, geodesics, and singularities.
Molecular nanocarbons with mechanical bonds
Researchers develop new synthesis method to create molecules with partial structures of fullerenes, graphene, and carbon nanotubes. They successfully synthesize catenanes and knots, which are expected to be used in molecular machines and have specific properties derived from the topology.
Spying on topology
Scientists have developed a new way to extract topological information from quantum materials using ultra-fast laser light, which can distinguish between trivial and topological insulators in a millionth of a billionth of a second. This method could lead to the development of optically-controlled electronics that process information te...
Realizing giant magnetic field by moiré pattern engineering
Scientists at the University of Hong Kong and Hunan Normal University have realized a giant magnetic field through moiré pattern engineering. The magnetic flux per supercell is quantized, and the field magnitude scales inversely with the square of the moiré period.
The best of two worlds: Magnetism and Weyl semimetals
Scientists have discovered magnetic Weyl semimetals, which exhibit both topological and magnetic properties. These materials have the potential to enable dissipationless transport and revolutionize data storage and energy conversion.
Princeton physicists discover topological behavior of electrons in 3D magnetic material
Researchers found a magnetic material at room temperature enabling collective electron behavior mimicking massless particles and anti-particles. This phenomenon is attributed to topology, a branch of mathematics governing electron behavior in crystals.
Exotic physics phenomenon is observed for first time
Researchers have directly observed the non-Abelian Aharonov-Bohm Effect, a predicted exotic phenomenon involving optical waves and synthetic magnetic fields. The finding may offer a step toward fault-tolerant quantum computers.