Zhang Yan's group in International Center for Quantum Materials (ICQM) at Peking University reports the discovery of an exotic metal-insulator transition in a surface-doped transition metal dichalcogenide.
The headquarter of a eukaryotic cell is the nucleus, and most of the cell's information and instructions are stored there in the form of DNA (Deoxyribonucleic acid). The DNA, which is twisted, rolled and bundled two-meter-long chain, together with protein molecules, makes up the chromatin fiber that lays inside the nucleus. For years, scientists were curious how these components are organized. How is it possible that proteins necessary in biochemical reactions move efficiently within the nucleus full of DNA?
For years, in the vastness of our galaxy, astrophysicists have been tracking down pevatrons - natural accelerators of particles with monstrous energies. Thanks to the HAWC Observatory for Cosmic Radiation, another probable trace of their existence has just been found: photons with some of the highest energies. However, what is particularly important is that this time the high-energy photons have not only been recorded, but also their probable place of origin has been determined.
A study from Chalmers University of Technology, Sweden, has yielded new answers to fundamental questions about the relationship between the size of an atom and its other properties, such as electronegativity and energy. The results pave the way for advances in future material development. For the first time, it is now possible under certain conditions to devise exact equations for such relationships.
A pair of Israeli scientists managed to track puzzling January and February 2020 spikes in a measure of particle-laden haze to those fires, and then, in a paper recently published in Science, they uncovered the "perfect storm" of circumstances that swept the particles emitted from those fires into the upper atmosphere and spread them over the entire Southern Hemisphere.
An MIT study suggests coronaviruses, including the virus that causes Covid-19, may be vulnerable to ultrasound vibrations. Simulations suggest ultrasound waves at medical imaging frequencies can cause the virus' shell and spikes to collapse and rupture.
Researchers have channeled the universe's earliest light - a relic of the universe's formation known as the cosmic microwave background - to solve a missing-matter mystery and learn new things about galaxy formation. Their work could also help us to better understand dark energy and test Einstein's theory of general relativity by providing new details about the rate at which galaxies are moving toward us or away from us.
We've all come across them before: Those little bags of small balls that come packed together with new shoes or electrical goods. The balls are there to absorb moisture so as to protect the items from damage. 'These materials act like a sponge,' explains physicist Professor Rustem Valiullin from Leipzig University.
Solar cells made of crystalline silicon achieve peak efficiencies, especially in combination with selective contacts made of amorphous silicon (a-Si:H). However, their efficiency is limited by losses in these contact layers. Now, for the first time, a team at Helmholtz-Zentrum Berlin (HZB) and the University of Utah, USA, has experimentally shown how such contact layers generate loss currents on the nanometre scale and what their physical origin is.
Scientists in Japan have observed, and interfered with, the ultrafast motion of electron movement inside of a Xenon atom using synchrotron radiation. The ability of synchrotron radiation to observe and control such ultrafast processes could open new applications in the development of functional materials and electronic devices in the future.