Sudhakara Allam’s Post

We may be nearing the era of new computing systems birth soon with the help of spintronics that are going to be highly scalable and reduces complexity by many folds. These researchers solved 20 year old puzzle of observing three dimensional vortex in zero dimensional ferroelectrics. KAIST has, for the first time, experimentally clarified the three-dimensional, vortex-shaped polarization distribution inside ferroelectric nanoparticles through international collaborative research with POSTECH, SNU, KBSI, LBNL and University of Arkansas. About 20 years ago, Prof. Laurent Bellaiche (currently at University of Arkansas) and his colleagues theoretically predicted that a unique form of polarization distribution, arranged in a toroidal vortex shape, could occur inside ferroelectric nanodots. They also suggested that if this vortex distribution could be properly controlled, it could be applied to ultra-high-density memory devices with capacities over 10,000 times greater than existing ones. Using atomic electron tomography, the team completely measured the positions of cation atoms inside barium titanate (BaTiO3) nanoparticles, a well-known ferroelectric material, in three dimensions. From the precisely determined 3D atomic arrangements, they were able to further calculate the internal three-dimensional polarization distribution at the single-atom level. The analysis of the polarization distribution revealed, for the first time experimentally, that topological polarization orderings including vortices, anti-vortices, skyrmions, and a Bloch point occur inside the zero-dimensional ferroelectrics, as theoretically predicted 20 years ago. Furthermore, it was also found that the number of internal vortices can be controlled depending on their sizes. Prof. Sergey Prosandeev and Prof. Bellaiche (who proposed with other co-workers the polar vortex ordering theoretically 20 years ago), joined this collaboration and further proved that the vortex distribution results obtained from experiments are consistent with theoretical calculations. By controlling the number and orientation of these polarization distributions, it is expected that this can be utilized in a next-generation high-density memory device that can store more than 10,000 times the amount of information in the same-sized device compared to existing ones. #climatechange #spintronics #valleytronics #hpc #aiml #energy

Researchers have developed a method to grow ultra-flat bismuth crystals inside a van der Waals nanoscale mold, unlocking enhanced electronic transport and quantum oscillations. 🧬🔬 Read the full story here: https://lnkd.in/ez6JDRUp #QuantumTech #QuantumMaterials #Nanotechnology

Thank you so much, Peter Bradley, for quoting me in this fascinating discussion – truly an honor! 🌟 Your post encapsulates an extraordinary leap forwards in the realms of optics and nanotechnology. The potential to achieve optical imaging down to sub-nanometer levels could indeed be the linchpin in a new era of scientific exploration and innovation. ✨ Delving into the ultra-confined conditions where photons shed their wave-particle duality presents us with a thrilling panorama of possibilities. It prompts us to reconsider what we know about the quantum world and how it intertwines with the macroscopic realm we navigate daily. 🤔 As an advocate for open science, I passionately believe such groundbreaking findings should serve as a beacon of collaboration and innovation. Open science not only fosters transparency but also accelerates the pace of discovery by pooling collective minds and resources. 🌍 Just as open source has revolutionized the tech industry by promoting collaboration and innovation, the realm of patents, when aligned with the principles of open science, can similarly act as a fertile ground for transparent knowledge sharing, thereby proving that intellectual property and open science can not only coexist but thrive together.🔍 To the scientific community, academia, and industry leaders, let's embrace these thrilling opportunities with open arms and minds. By fostering a culture of cooperation and open-minded exploration, there's no limit to the breakthroughs we can achieve together. Here's to unlocking the secrets of the universe, one photon at a time. Cheers to the future of science and innovation! 😉👍😎🚀

Optical imaging down to sub-nm by exploiting the particle nature of photons! - Claimed breakthrough discovery is published - Design and operation details are disclosed - Experimental result evidences are available - Dreamed fast throughput nano metrological instrument A wake-up call to science, academia and industry, as "Patents never lie"* At the core: - the reported observation that optical imaging resolution becomes independent of the wavelength of photons when operated under certain confinement conditions, -the reported gained understanding that the wave property of photons are environmental dependent and lose their wave-particle duality under ultra-confined conditions. Some brainstorming triggering questions: - Could some analogy be made with nano-fludics ultra-confined flow and quantum coupling phenomena that allowed to deliver new understanding of frictionless flow in nano-tubes? - In the age of quantum hype, could there be other quantum coupling phenomena to be brought into the picture? - Other suggestions? - May key actors in open science leverage this example and similar such cases to valorize their visions and values, and make sure that open science brings along expected open mindedness to also support fundamental breakthroughs coming from non-academic affiliates. #optics #semiconductors #EUV #lithography #nems #nano #wafer #inspection #quantum #sensors #openscience #science * quote from Dr. Benjamin DELSOL 🤔

New research led by the FLEET team at The Australian National University reveals the high spectral purity (ie, ultra-narrow linewidth) of a novel exciton-polariton laser, with promise for practical low-energy applications. ‘Snapshot’ interferometer linewidth measure, which avoided time-averaging limitations and offered unprecedented levels of detail obscured in previous measurements, revealed an ultra-narrow linewidth ten times finer than previously published results. This places low-energy polariton lasers on par with lasers used in facial-recognition and augmented-reality. The work pushes the boundaries of exciton-polariton laser technology, while a long coherence time opens up new avenues in classical and quantum computing. Read more at https://lnkd.in/gPqU4Jbz Or read the paper “Narrow-linewidth exciton-polariton laser” published Optica DOI: 10.1364/OPTICA.525961 https://lnkd.in/ehPBjdMP Nice work Bianca Rae Fabricante, Mateusz Król, Matthias Wurdack, Maciej Pieczarka, Mark Steger, David Snoke, Ken West, Loren Pfeiffer, Andrew Truscott, Elena Ostrovskaya, and Eliezer Estrecho

"Researchers from Huazhong University of Science and Technology proposed a pixelated programmable photonic integrated circuit (PICs) with record-high 20-level intermediate states of phase change materials (PCMs). The work, reported in the International Journal of Extreme Manufacturing, could pave the way for the applications of laser-induced PCMs in neuromorphic photonics, optical computing, and reconfigurable metasurfaces. Prof. Jinlong Zhu, corresponding author at the School of Mechanical Science and Engineering of HUST explains, "The research on programmable PCMs-based PICs and metasurfaces primarily utilized thermal annealing and electrothermal switching. In contrast, multi-level PCMs with free-space laser switching offer significantly enhanced flexibility in phase modulation."" #photonicintegratedcircuit #pic

Light zipping through the emptiness of space moves at one speed and one speed only - 299,792 kilometers (about 186,000 miles) per second. Yet if you throw a mess of electromagnetic fields into its path, such as those surrounding ordinary matter, that extraordinary velocity starts to slow. Most transparent materials will slow light by a tiny fraction. It's the changes in speed that cause light to bend as it passes from one medium to another. But really putting the brakes on requires special materials like photonic crystals or even super-chilled quantum gases. Scientists have previously established that light can be slowed down in certain scenarios, and a new study demonstrates a method for achieving it that promises to be one of the most useful approaches yet. #quantum #light #laser #trickery #metasurface https://lnkd.in/gEq2gjXM

This is an actual image of a molecule IBM researchers utilized advanced atomic force microscopy (AFM) techniques to capture this stunning visual representation of a single nanographene molecule. This breakthrough imaging showcases: 1. Atomic resolution: Individual atoms are visible. 2. Molecular structure: Hexagonal arrangement of carbon atoms. 3. Bonding: Chemical bonds between atoms. Nanographene, a 2D material, has remarkable properties: 1. High electrical conductivity 2. Mechanical strength 3. Thermal stability Applications: 1. Electronics 2. Energy storage 3. Quantum computing Read more: - IBM Research: https://ibm.co/1MUAKDg - Science paper: https://bit.ly/1Nh7Os2 - Nano Letters paper: https://bit.ly/1FSWfnW Mind-blowing fact: This image is not an artist's rendition; it's a real, atom-by-atom visualization! #Nanotechnology #Graphene #AtomicForceMicroscopy #IBMResearch #MaterialsScience #ScienceVisualization #NanoImaging

A lot of quantum computing and sensing systems, like Rydberg atoms and trapped ions, require very short wavelengths of light to operate. Blue and even ultraviolet photons must be divided up into many channels and have each of those channels precisely and rapidly modulated in phase or amplitude before they're delivered to the qubits. Doing this in a *scalable* way is incredibly challenging, as scattering losses at these wavelengths are very large, and most materials just plain absorb there. Here, we demonstrate an all-CMOS-fabricated architecture, made on 200 mm silicon wafers, for the scalable channelization and modulation of photons as short as 320 nm using Al2O3/SiO2 waveguides that are piezo-optomechanically modulated by integrated AlN modulators, with propagation losses at 320 nm of around 1 dB/cm. This should greatly aid in the scaling and real-world deployment of these amazing quantum systems. In addition, there are a lot of lab-on-chip applications in chemistry and biology that may have their throughput greatly enhanced by such a photonics technology. I should mention that 320 nm, which is the single-photon Rydberg transition wavelength for neutral cesium atoms, just happens to be the shortest wavelength we were able to reasonably generate in the lab, thanks to our colleagues down the hall who do Rydberg atom physics. It's entirely possible this system works down to the alumina bandgap, which is about 210 nm. Happy reading! Bethany Little Michael Gehl Dominguez, Daniel Andrew Leenheer Roman Shugayev

Spintronics field has been using ferromagnets and antiferromagnets for quite sometime towards providing methods for fabrication of highly scalable devises including but not limited to ultrafast nonvolatile universal memories, whereas, these researchers found materials that exhibit properties that are key to both of these and in that process a new magnetism is found called altermagnetism. Altermagnetism introduces a third magnetic phase, combining the non-magnetization of antiferromagnets with the strong spin-dependent phenomena of ferromagnets. Discovered through international collaboration, this new phase offers significant potential for spintronics, bridging previous gaps in magnetic material applications. Altermagnets have a special combination of the arrangement of spins and crystal symmetries. The spins alternate, as in antiferromagnets, resulting in no net magnetization. Yet, rather than simply canceling out, the symmetries give an electronic band structure with strong spin polarization that flips in direction as you pass through the material’s energy bands – hence the name altermagnets. This results in highly useful properties more resemblant of ferromagnets, as well as some completely new properties. Altermagnets have zero net magnetization together with the coveted strong spin-dependent phenomena typically found in ferromagnets – merits that were regarded as principally incompatible. They uncovered more than two hundred altermagnetic candidates in materials ranging from insulators and semiconductors, to metals and superconductors. Obtaining direct experimental proof of altermagnetism’s existence required demonstrating the unique spin symmetry characteristics predicted in altermagnets. The proof came using spin- and angle resolved photoemission spectroscopy at the SIS (COPHEE endstation) and ADRESS beamlines of the SLS. This technique enabled the team to visualize a tell-tale feature in the electronic structure of a suspected altermagnet: the splitting of electronic bands corresponding to different spin states, known as the lifting of Kramers spin degeneracy. The discovery was made in crystals of manganese telluride, a well-known simple two-element material. Traditionally, the material has been regarded as a classic antiferromagnet because the magnetic moments on neighboring manganese atoms point in opposite directions, generating a vanishing net magnetization. As well as its advantages to the developing field of spintronics, it also offers a promising platform for exploring unconventional superconductivity, through new insights into superconducting states that can arise in different magnetic materials. #climatechange #spintronics #universalmemory #superconductors