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Blog – Page 75

Electron transport in bilayer graphene exhibits a pronounced dependence on edge states and a nonlocal transport mechanism, according to a study led by Professor Gil-Ho Lee and Ph.D. candidate Hyeon-Woo Jeong of POSTECH’s Department of Physics, in collaboration with Dr. Kenji Watanabe and Dr. Takashi Taniguchi at Japan’s National Institute for Materials Science (NIMS).

The findings are published in the journal Nano Letters.

Bilayer graphene, comprising two vertically stacked graphene layers, can exploit externally applied electric fields to modulate its electronic band gap—a property essential for . This distinctive feature has drawn considerable attention for its prospective role in “valleytronics,” an emerging paradigm for next-generation data processing.

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Molecular crystals with conductivity and magnetism, due to their low impurity concentrations, provide valuable insights into valence electrons. They have helped link charge ordering to superconductivity and to explore quantum spin liquids, where electron spins remain disordered even at extremely low temperatures.

Valence electrons with are also expected to exhibit emergent phenomena, making these essential for studying novel material functionalities.

However, the extent to which valence electrons in molecular crystals contribute to magnetism remains unclear, leaving their quantum properties insufficiently explored. To address this, a research team used light to analyze valence electron arrangements, building on studies of superconductors and quantum spin liquids. The findings are published in Physical Review B.

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Bimetallic particles, made from a combination of a noble metal and a base metal, have unique catalytic properties that make them highly effective for selective heterogeneous hydrogenation reactions. These properties arise from their distinctive geometric and electronic structures. For hydrogenation to be both effective and selective, it requires specific interactions at the molecular level, where the active atoms on the catalyst precisely target the functional group in the substrate for transformation.

Nanoscale Engineering and Electronic Structure Tuning

Scaling these particles down to nanoscale atomic clusters or single-atom alloys further enhances their catalytic performance. This reduction in size increases surface dispersion and optimizes the use of noble metal atoms. Additionally, these nanoscale changes alter the electronic structure of the active sites, which can significantly influence the activity and selectivity of the reaction. By carefully adjusting the bonding between noble metal single atoms and the base metal host, researchers can create flexible environments that fine-tune the electronic properties needed to activate specific functional groups. Despite these advances, achieving atomically precise fabrication of such active sites remains a significant challenge.

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Galactic gravity can dramatically impact wide binary stars, pushing them towards unexpected mergers or collisions.

The detection of gravitational waves.

Gravitational waves are distortions or ripples in the fabric of space and time. They were first detected in 2015 by the Advanced LIGO detectors and are produced by catastrophic events such as colliding black holes, supernovae, or merging neutron stars.

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Researchers are starting to find patterns in how we sleep that could point to early signs of dementia or Parkinson’s disease.

There are some obvious signs that your loved one could be showing early signs of dementia, which affects almost seven million people in the US.

The common signs include being unable to learn new tasks, struggling to stay focussed, finding it hard to contribute in conversations, mistaking things for other objects and/or getting unusually emotional or afraid.

Continue reading “Scientists discover dream people have that could be an early sign of dementia ‘in almost all cases’” | >

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The Moon still holds mysteries that leave scientists in awe. A massive, heat-radiating object beneath its surface has sparked new questions about its origins.

This discovery offers a glimpse into the Moon’s hidden history, challenging what we thought we knew about our celestial neighbor.

Bryan Johnson said taking rapamycin may have done more harm than good to his health.

Continue reading “Anti-Ageing Influencer Bryan Johnson Ditches ‘Longevity’ Medicine Over Health Concerns” | >

The Moon still holds mysteries that leave scientists in awe. A massive, heat-radiating object beneath its surface has sparked new questions about its origins.

This discovery offers a glimpse into the Moon’s hidden history, challenging what we thought we knew about our celestial neighbor.

The Moon, long considered a cold and barren landscape, has just revealed a fascinating new secret. Hidden beneath its far side lies a massive heat-emitting feature that has scientists buzzing with questions. This isn’t just any ordinary discovery—it involves a rare geological phenomenon typically associated with Earth.

Continue reading “Heat Is Radiating From A Huge Mass Under The Moon” | >

“We initially expected the carbon-to-oxygen ratio in the planet might be similar to the disk,” said Dr. Chih-Chun “Dino” Hsu. “But, instead, we found the carbon, relative to oxygen, in the planet was much lower than the ratio in the disk.”

What is the official process of planetary formation and evolution and is this process uniform for all planetary bodies throughout the universe? This is what a recent study published in The Astrophysical Journal Letters hopes to address as a team of researchers investigated a young exoplanet still forming within its protoplanetary disk that could offer clues into the secrets behind planetary formation and evolution. Additionally, it holds the potential to provide greater complexity with longstanding planetary formation models, which have traditionally presented simple scenarios for planetary formation and evolution.

For the study, the researchers used the W. M. Keck Observatory to observe PDS 70b, which is a gas giant planet approximately three Jupiter masses and located 369 light-years from Earth. What makes PDS 70b interesting for astronomers is its age, as it’s estimated to be approximately 5 million years old, meaning it is still gathering material from the system’s disk, also known as accretion.

Using Keck, the researchers analyzed the light spectra of PDS 70b’s atmosphere to ascertain its carbon-to-oxygen ration and compared this data to the carbon-oxygen ratio of the protoplanetary disk that PDS 70b resides. In the end, the researchers found that PDS 70b carbon-to-oxygen ratio was lower than the surrounding disk, which challenges previous notions of planetary formation models, and the methods used to build those models.

Continue reading “Exoplanet Study Challenges Simplified View of Planetary Growth” | >