Physicists find misaligned carbon sheets yield unparalleled properties

Science Daily  July 31, 2020 In an earlier study an international team of researchers (Yale University, UT Dallas, Japan) showed that when offset by 0.93 degrees, twisted bilayer graphene exhibits both superconducting and insulating states, thereby widening the magic angle significantly. In the current research they set out to determine how mid-infrared light might affect the conductance of electrons in twisted bilayer graphene. Their work involved calculating the light absorption based on the moiré pattern’s band structure. They showed that the theoretical results not only matched well with the experimental findings, but also pointed to a mechanism that is fundamentally […]

Scientists discover new class of semiconducting entropy-stabilized materials

Science Daily  July 31, 2020 Almost all entropy-stabilized materials so far are either conducting metals or insulating ceramics. Researchers at the University of Michigan have experimentally synthesized and characterized a new class of the multicationic and -anionic entropy-stabilized chalcogenide alloys based on the (Ge,Sn,Pb)(S,Se,Te) formula. The configurational entropy from the disorder of both the anion and the cation sublattices reaches a record value for the equimolar composition and stabilizes the single-phase solid solution. Theoretical calculations and experiments both show that the synthesized alloys are thermodynamically stable at the growth temperature and kinetically metastable at room temperature. Doping and electronic transport […]

Scientists find way to track space junk in daylight

Phys.org  August 4, 2020 Utilizing a higher-powered laser, space debris laser ranging detects diffuse reflections from defunct satellites or rocket bodies up to 3000 km. So far space debris laser ranging was only possible within a few hours around twilight while it is dark at the satellite laser ranging station and space debris is illuminated by the sun. An international team of researchers (Austria, Spain, Germany) has extended the visible window using a combination of a telescopic detector and filter to increase the contrast of objects as they appear against the sky during the day. Overall, the new technique could […]

Sharing a secret…the quantum way

Science Daily  July 31, 2020 By taking advantage of the high‐dimensional Hilbert space for orbital angular momentum and using Perfect Vortex beams as their carriers, researchers in South Africa have presented a proof‐of‐principle implementation of a high‐dimensional quantum secret sharing scheme. This scheme is experimentally implemented with a fidelity of 93.4%, for 10 participants in =11 dimensions. The implementation can easily be scaled to higher dimensions and any number of participants, opening the way for securely distributing information across a network of nodes…read more. TECHNICAL ARTICLE

Thermal chaos returns quantum system to its unknown past

Nanowerk  August 6, 2020 The previous work of an international team of researchers (Russia, USA – Argonne National Laboratory, University of Chicago) dealt with a predefined quantum state. The problem with having to know which state you are reversing is the need to record it. This was not really an issue for the small computer made up of two or three quantum bits, which was used in last year’s study. But scaling up the experiment ramps up the memory requirements. Each additional qubit doubles the amount of memory needed. To address this, the researchers came up with a universal algorithm […]

Whitepaper evaluates opportunities and risks of nanomaterials

Nanowerk  August 4, 2020 An international team of researchers led by Italy provides an overview of the state‐of‐the‐art regarding risk governance of nanomaterials (NMs) and lays out the theoretical basis for the development and implementation of an effective, trustworthy, and transparent risk governance framework for NMs. The proposed framework enables continuous integration of the evolving state of the science, leverages best practice from contiguous disciplines and facilitates responsive re‐thinking of nanosafety governance to meet future needs. They developed a science‐based Risk Governance Council (RGC) for NM research. The framework to be expanded to relevant advanced materials and emerging technologies…read more. […]

Top 10 Science and Technology Inventions for the Week of July 31, 2020

01. Metal-breathing bacteria could transform electronics, biosensors, and more 02. New fabric could help keep you cool in the summer, even without A/C 03. Researchers create surface coating that can create false infrared images 04. Scientists develop novel transparent broadband electromagnetic interference shielding materials 05. Self-healing soft material outsmarts nature 06. Tailored meta-grid of nanoparticles boosting performance of light-emitting diodes 07. Army research enables conversational AI between soldiers, robot 08. ‘Drawn-on-skin’ electronics offer breakthrough in wearable monitors 09. Taking the guesswork out of twistronics 10. ‘Fool’s gold’ may be valuable after all And others… Back to the Lab? We Want […]

Army research enables conversational AI between soldiers, robot

EurekAlert  July 27, 2020 A team of researchers in the US (US Army, University of Southern California) supported by the Army Next Generation Combat Vehicle Army Modernization Priority and the Army Priority Research Area for Autonomy has developed the Joint Understanding and Dialogue Interface (JUDI) which enables bi-directional conversational interactions between soldiers and autonomous systems through bidirectional speech and dialogue in tactical operations. The technology gives the robot the ability to ask for clarification or provide status updates as tasks are completed. The dialogue processing is based on a statistical classification method. JUDI is designed for tasks that require reasoning […]

Back to the Lab? We Want to Hear From You

American Physical Society  July 27, 2020 As scientists around the world are slowly returning to their offices and labs APS News and Physics want to hear about their experiences. What plans have they made to keep themselves or their group safe? How is distancing affecting their interactions? How have months away from the lab affected their perspective? Tell them your story in a brief (100–200 words) letter to physics@aps.org. Pictures are welcome too. Each week, APS News and Physics will select a few of these letters and photos to share online…read more.

‘Drawn-on-skin’ electronics offer breakthrough in wearable monitors

EurekAlert  July 30, 2020 The existing wearable bioelectronics are susceptible to motion artifacts as they lack proper adhesion and conformal interfacing with the skin during motion. A team of researchers in the US (University of Houston, University of Chicago) has developed ultra-conformal Drawn-on-Skin (DoS) electronics as a new bioelectronic platform for on-demand multifunctional, motion artifact-free sensing. The devices are based on the Ag flakes/poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (Ag-PEDOT:PSS) composite, poly(3-hexylthiophene-2,5-diyl) nanofibrils (P3HT-NF), and ion gel as the conductive, semiconducting, and dielectric inks, respectively. As a versatile platform, DoS electronics devices such as thin-film transistors, strain sensors, and electrophysiological sensors have been developed. It […]