Current Topological insulators News and Events

Current Topological insulators News and Events, Topological insulators News Articles.
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A new beat in quantum matter
Oscillatory behaviors are ubiquitous in Nature, ranging from the orbits of planets to the periodic motion of a swing. In pure crystalline systems, presenting a perfect spatially-periodic structure, the fundamental laws of quantum physics predict a remarkable and counter-intuitive oscillatory behavior: when subjected to a weak electric force, the electrons in the material do not undergo a net drift, but rather oscillate in space, a phenomenon known as Bloch oscillations. (2020-11-23)

Social bacteria build shelters using the physics of fingerprints
When starvation threatens, forest-dwelling Myxococcus xanthus bacteria work collectively to form fruiting bodies, spongy mushroom-like growths that promote survival. Princeton researchers have identified how these bacteria harness the same physical laws that lead to the whorls of a fingerprint to build the structures layer by layer. (2020-11-23)

Biophysics - geometry supersedes simulations
Ludwig-Maximilians-Universitaet (LMU) in Munich physicists have introduced a new method that allows biological pattern-forming systems to be systematically characterized with the aid of mathematical analysis. The trick lies in the use of geometry to characterize the dynamics. (2020-11-20)

Confirming simulated calculations with experiment results
Dr Zi Yang MENG from Division of Physics and Astronomy, Faculty of Science, the University of Hong Kong (HKU), is pursuing a new paradigm of quantum material research that combines theory, computation and experiment in a coherent manner. Recently, he teamed up with Dr Wei LI from Beihang University, Professor Yang QI from Fudan University, Professor Weiqiang YU from Renmin University and Professor Jinsheng WEN from Nanjing University to untangle the puzzle of Nobel Prize-winning theory Kosterlitz-Thouless (KT) phase. (2020-11-19)

UT researchers establish proof of principle in superconductor study
Three physicists in the Department of Physics and Astronomy at the University of Tennessee, Knoxville, together with their colleagues from the Southern University of Science and Technology and Sun Yat-sen University in China, have successfully modified a semiconductor to create a superconductor, which may lead to unforeseen advancements in technology. (2020-11-18)

Driver behavior influences traffic patterns as much as roadway design, study reports
Urban planners may soon have a new way to measure traffic congestion. By capturing the different routes by which vehicles can travel between locations, researchers have developed a new computer algorithm that helps quantify regions of congestion in urban areas and suggests ways around them. (2020-11-17)

Handles and holes in abstract spaces: how a material conducts electricity better
A new theory has succeeded in establishing a new relationship between the presence or absence of 'handles' in the space of the arrangements of atoms and molecules that make up a material, and the propensity of the latter to conduct electricity. The insulating materials 'equipped with handles' can conduct electricity as well as metals, while retaining typical properties of insulators, such as transparency. (2020-11-13)

New approach to circuit compression could deliver real-world quantum computers years ahead of schedu
A major technical challenge for any practical, real-world quantum computer comes from the need for a large number of physical qubits to deal with errors that accumulate during computation. Such quantum error correction is resource-intensive and computationally time-consuming. But researchers have found an effective software method that enables significant compression of quantum circuits, relaxing the demands placed on hardware development. (2020-11-12)

Innovative machine-learning approach for future diagnostic advances in Parkinson's disease
In a new study led by the Immune Systems Biology research group of the LIH Department of Infection and Immunity, researchers adopted a holistic machine-learning approach to elucidate how the interactions between neuronal mitochondria can serve as a powerful tool to distinguish nerve cells from Parkinson's patients from those belonging to healthy subjects, thereby providing new insights in the pathogenesis, diagnosis and treatment of this neurodegenerative disorder. The results were published in 'Nature Partner Journals Systems Biology and Application'. (2020-11-12)

Blue phosphorus: How a semiconductor becomes a metal
Blue phosphorus, an atomically thin synthetic semiconductor, becomes metallic as soon as it is converted into a double layer. This has been discovered by an interdisciplinary team led by Prof Thomas Heine from TU Dresden and Prof Gabriel Merino from the Mexican research institute Cinvestav Merida. The scientists are first to describe the possibility of constructing nanoscale, highly efficient transistors consisting of only one element. (2020-11-05)

Tunable THz radiation from 3D topological insulator
Wu's research group has been investigating a three-dimensional topological insulator of bismuth telluride (Bi2Te3) as a promising basis for an effective THz system. They recently systematically investigated THz radiation from Bi2Te3 nanofilms driven by femtosecond laser pulses. (2020-11-02)

Magnetic nature of complex vortex-like structures in a Kagome crystal Fe3Sn2
Three-dimensional magnetic bubbles were demonstrated from the view of integral magnetizations for the first time, which clarify the physics behind complex multi-ring and arc-shaped vortices obtained from two-dimensional transmission electron microscopy magnetic imaging. (2020-10-28)

Knotting semimetals in topological electrical circuits
Scientists created exotic states of matter using electrical circuit enhanced by machine-learning algorithm (2020-10-28)

Topology gets magnetic: The new wave of topological magnetic materials
The electronic structure of nonmagnetic crystals can be classified by complete theories of band topology, reminiscent of a 'topological periodic table.' However, such a classification for magnetic materials has so far been elusive, and hence very few magnetic topological materials have been discovered to date. In a new study published in the journal Nature, an international team of researchers has performed the first high-throughput search for magnetic topological materials, finding over 100 new magnetic topological insulators and semimetals. (2020-10-28)

Hidden-symmetry-enforced nexus points of nodal lines in layer-stacked dielectric photonic crystals
The paper reveals that Maxwell's equations can have hidden symmetries induced by the fractional periodicity of the material tensor components and paves the way to finding novel topological degeneracies unique in photonics. The idea is exemplified by an AB-layer-stacked dielectric photonic crystal, where the unique photonic band connectivity leads to a new kind of symmetry-enforced triply degenerate points with exotic spin-1 conical diffractions at the nexuses of two nodal rings and a Kramers-like nodal line (2020-10-20)

Kitchen temperature supercurrents from stacked 2D materials
A 'stack' of 2D materials could allow for supercurrents at ground-breakingly warm temperatures, easily achievable in the household kitchen. An international study published in August opens a new route to high-temperature supercurrents -- at temperatures, as 'warm' as inside your kitchen fridge. (Previously, superconductivity has been difficult even at temperatures as low as -170°C, making superconductivity impractical for many of its most exciting applications.) (2020-10-20)

'Classified knots': uOttawa researchers create optical framed knots to encode information
In a world first, researchers from the University of Ottawa in collaboration with Israeli scientists have been able to create optical framed knots in the laboratory that could potentially be applied in modern technologies. Their work opens the door to new methods of distributing secret cryptographic keys - used to encrypt and decrypt data, ensure secure communication and protect private information. (2020-10-16)

When Fock meets Landau: Topology in atom-photon interactions
Topological photonics concerns the classical wave simulation of electronic band topology. Does the quantum nature of light embed new topological states? By exploiting the similarity between the Jaynes-Cummings model and graphene, topological states of quantized light were found with a wealth of physics involving the valley Hall effect, the Haldane model and the Lifshitz topological transition. This research built a bridge between quantum electrodynamics and topological phases in condensed matter physics. (2020-10-14)

Stacking and twisting graphene unlocks a rare form of magnetism
A team of researchers at Columbia University and the University of Washington has discovered that a variety of exotic electronic states, including a rare form of magnetism, can arise in a three-layer graphene structure. (2020-10-12)

Penn engineers create helical topological exciton-polaritons
Researchers at the University of Pennsylvania's School of Engineering and Applied Science are the first to create an even more exotic form of the exciton-polariton, one which has a defined quantum spin that is locked to its direction of motion. Depending on the direction of their spin, these helical topological exciton-polaritons move in opposite directions along the surface of an equally specialized type of topological insulator. (2020-10-12)

Twisting magnetization with light
A team of scientists led by the Max Born Institute (MBI), Berlin, Germany, and the Massachusetts Institute of Technology (MIT), Cambridge, USA, has demonstrated how tiny magnetization patterns known as skyrmions can be written into a ferromagnetic material faster than previously thought possible. The researchers have clarified how the topology of the magnetic system changes in this process. The findings may inspire new routes how to use magnetic skyrmions in information technology. (2020-10-05)

Research may curb economic losses to power plants after earthquakes
Sitting atop power transformers are bushing systems that play a critical role in supplying communities with electricity. However, these objects are also susceptible to breaking during earthquakes. Once damaged, bushings can cause widespread outages and burden a state with expensive repairs. (2020-10-01)

AI learns to trace neuronal pathways
Cold Spring Harbor Laboratory scientists dramatically improved the efficiency of automated methods for tracing neuronal connections. They taught a computer to recognize different parts of neurons, then used the math of topology to see how those neurons are likely to connect. (2020-09-28)

A new study may revise a theory of flowing viscous liquids that was accepted for 60 years
The international collaborative team has discovered for the first time a topological change of a classical interfacial hydrodynamics, which is driven by 'a partially miscibility'. This phenomenon cannot be seen in completely mixed (fully miscible) system with infinite solubility or immiscible system with no solubility. (2020-09-28)

Bridging the gap between the magnetic and electronic properties of topological insulators
Scientists at Tokyo Institute of Technology shed light on the relationship between the magnetic properties of topological insulators and their electronic band structure. Their experimental results shed new insights into recent debates regarding the evolution of the band structure with temperature in these materials, which exhibit unusual quantum phenomena and are envisioned to be crucial in next-generation electronics, spintronics, and quantum computers. (2020-09-24)

Metal wires of carbon complete toolbox for carbon-based computers
Carbon-based computers have the potential to be a lot faster and much more energy efficient than silicon-based computers, but 2D graphene and carbon nanotubes have proved challenging to turn into the elements needed to construct transistor circuits. Graphene nanoribbons can overcome these limitations, but to date scientists have been made only semiconductors and insulators, not the metallic wires to connect them. UC Berkeley scientists have now achieved the goal of a metallic graphene nanoribbon. (2020-09-24)

Unraveling the genome in 3D-space
Proper folding of extremely long chromosomal DNA molecules is crucial for the correct functioning of the cell. Scientists from the Gerlich lab at IMBA - Institute of Molecular Biotechnology of the Austrian Academy of Sciences - developed a groundbreaking method to map contact points between replicated DNA molecules, thereby elucidating how the genome is folded inside the nucleus of human cells. (2020-09-23)

Reviewing the quantum material 'engine room', QAHE
An Australian collaboration reviews the quantum anomalous Hall effect (QAHE), one of the most fascinating and important recent discoveries in condensed-matter physics. QAHE allows zero-resistance electrical 'edge paths' in emerging quantum materials such as topological insulators, opening great potential for ultra-low energy electronics. (2020-09-16)

Microsoft and University of Copenhagen collaboration yields promising material for quantum computing
Researchers at the Microsoft Quantum Materials Lab and the University of Copenhagen, working closely together, have succeeded in realizing an important and promising material for use in a future quantum computer. For this end, the researchers have to create materials that hold the delicate quantum information and protect it from decoherence. (2020-09-16)

Superconductors are super resilient to magnetic fields
A Professor at the University of Tsukuba provides a new theoretical mechanism that explains the ability of superconductive materials to bounce back from being exposed to a magnetic field. This work may lead to energy systems that operate without resistive losses. It is also useful for building qubits for quantum computers. (2020-09-10)

Evidence of power: Phasing quantum annealers into experiments from nonequilibrium physics
Scientists at Tokyo Institute of Technology (Tokyo Tech) use commercially available quantum annealers, a type of quantum computer, to experimentally probe the validity of an important mechanism from nonequilibrium physics in open quantum systems. The results not only shed light into the extent of applicability of this mechanism and an extension of it, but also showcase how quantum annealers can serve as effective platforms for quantum simulations. (2020-09-10)

Quirky response to magnetism presents quantum physics mystery
In a new study just published and highlighted as an Editor's Suggestion in Physical Review Letters, scientists describe the quirky behavior of one such magnetic topological insulator. The paper includes experimental evidence that intrinsic magnetism in the bulk of manganese bismuth telluride (MnBi2Te4) also extends to the electrons on its electrically conductive surface. Such materials could be just right for making qubits, but this one doesn't obey the rules. (2020-09-10)

Peel-apart surfaces drive transistors to the ledge
Surfaces featuring atomic-scale ledges and steps can act as reusable templates for producing nanoelectronic components. (2020-09-08)

A tiny instrument to measure the faintest magnetic fields
Physicists at the University of Basel have developed a minuscule instrument able to detect extremely faint magnetic fields. At the heart of the superconducting quantum interference device are two atomically thin layers of graphene, which the researchers combined with boron nitride. Instruments like this one have applications in areas such as medicine, besides being used to research new materials. (2020-09-07)

Discovery of unconventional hall effect
Hall effect plays a key role in condensed matter physics. A recent work reports unconventional Hall signal, which is nonzero for in-plane magnetic field perpendicular or parallel to the current. Theoretical analysis shows that the unconventional Hall signal originates from the Berry curvature of a tilted Weyl semimetal. This work adds a new member to Hall effect family and paves a new way to explore Berry curvature physics in topological materials. (2020-09-03)

Memory in a metal, enabled by quantum geometry
Berkeley researchers led by Professor Xiang Zhang in collaboration with a Stanford University team invented a new data storage method by making odd numbered layers slide relative to even-number layers in tungsten ditelluride, which is only 3nm thick. The arrangement of these atomic layers represents 0 and 1 for data storage. The researchers make use of quantum geometry to read information out. This material platform works ideally for memory, with independent 'write' and 'read' operation. (2020-09-01)

Topological superconducting phase protected by 1D local magnetic symmetries
Scientists from China and USA classified 1D gapped topological superconducting quantum wires with local magnetic symmetries (LMSs), in which the time-reversal symmetry is broken but its combinations with certain crystalline symmetries, such as MxT, C2zT, C4zT, and C6zT, are preserved. Two new types of topological superconducting phases with multiple Majorana Kramer pairs and multiple Majorana zero modes are presented. And the minimal models preserving C4zT symmetry are constructed to illustrate their novel topological properties. (2020-08-27)

A Politecnico di Milano study reveals DNA "grammar"
DNA three-dimensional structure is determined by a series of spatial rules based on particular protein sequences and their order. This was the finding of a study recently published in Genome Biology by Luca Nanni, PhD student in Computer Science and Engineering at Politecnico di Milano, together with Professors Stefano Ceri of the same University and Colin Logie of the University of Nijmegen. (2020-08-27)

Octupole corner state in a three-dimensional topological circuit
Higher-order topological insulators featuring quantized bulk polarizations and zero-dimensional corner states are attracting increasing interest due to their strong mode confinement. Recently, scientists from China and UK demonstrated in a 3D topological circuit the existence of octupole corner state, which is induced by the octupole moment of the bulk circuit and topologically protected by three anticommuting reflection symmetries. This work is not only of fundamental importance but also opens door towards realizations of novel electronic topological devices. (2020-08-26)

Three-dimensional quantum Hall effect and global picture of edge states in Weyl semimetals
Recently, Professor Xie and his collaborators investigate the three-dimensional quantum Hall effect in Weyl semimetals and elucidate a global picture of the edge states. (2020-08-25)

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