Poynting Vector

Electrons swarm in a soup of quantum entanglement in a new class of materials called strange metals

In day-to-day life, light seems intangible. We walk through it and create and extinguish it with the flip of a switch. But, like matter, light actually carries a little punch—it has momentum. Light constantly nudges things and can even be used to push spacecraft. Light can also spin objects if it carries orbital angular momentum (OAM)—the property associated with a rotating object's tendency to keep spinning.

In art, the negative space in a painting can be just as important as the painting itself. Something similar is true in insulating materials, where the empty spaces left behind by missing electrons play a crucial role in determining the material's properties. When a negatively charged electron is excited by light, it leaves behind a positive hole. Because the hole and the electron are oppositely charged, they are…

Nanophotonic light emitters are compact and versatile devices with wide-ranging applications in applied physics. In a new report now published on Science Advances, Ki Young Lee and a research team in physics and engineering in China and the UK, proposed to develop a topological beam emitter structure of a submicron-footprint size and high efficiency, with adaptable beam shaping capacity.

Article URL: https://physics.weber.edu/schroeder/r5/ Comments URL: https://news.ycombinator.com/item?id=32660485 Points: 1 # Comments: 1

We do not have a theory to tell us everything about how a black hole works, but new research is shedding a least some light on one of their many mysteries.

We might finally have an explanation for mysterious shadows of falling material in the atmosphere of the Sun, observed during solar flares.

MIT physicists created a long-lasting magnetic state in a material, using only light. The results provide a new way to control and switch antiferromagnetic materials, which are of interest for their potential to advance information processing and memory chip technology.

A common metal paper clip will stick to a magnet. Scientists classify such iron-containing materials as ferromagnets. A little over a century ago, physicists Albert Einstein and Wander de Haas reported a surprising effect with a ferromagnet. If you suspend an iron cylinder from a wire and expose it to a magnetic field, it will start rotating if you simply reverse the direction of the magnetic field.

Black holes are the most mysterious objects in the universe, with features that sound like they come straight from a sci-fi movie.

We've been looking at making PCB motors. So far, we've got some promising results, we can make a magnet jump around - and we can even make our motor turn. We can even get our motor up to pretty hig...

Researchers at Massachusetts Institute of Technology (MIT), the MIT-Harvard Center for Ultracold Atoms, Harvard University and Stanford University have recently unveiled the existence of unique helical spin states in Heisenberg quantum magnets. Their observations, published in a paper in Nature Physics, could have important implications for the simulation of spin-related physical processes and dynamics in quantum…

St. Louis Park's Elliott Tanner is one of the youngest college graduates in American history. He starts post-graduate studies in the fall at the U.

How do we move in space? It might seem like an astronaut could do a couple of back strokes in space, but according to conservation of momentum, it's just not possible.

A new publication by the PHENIX Collaboration at the Relativistic Heavy Ion Collider (RHIC) provides definitive evidence that gluon "spins" are aligned in the same direction as the spin of the proton they're in. The result, just published in Physical Review Letters, provides theorists with new input for calculating how much gluons—the gluelike particles that hold quarks together within protons and…

A new theory describes how particle interactions fuel fast magnetic reconnection, the process behind solar flares and other astrophysical jets.

An international team of astrophysicists has discovered something wholly new, hidden in the center of the Milky Way galaxy.

A group of international researchers said a jet from a galaxy with a supermassive black hole at its center had changed direction and is pointing at us.

A geomagnetic field is generated in Earth's interior and extends into outer space to protect Earth from cosmic radiation and the charged particles of solar wind. The magnetic field is generated by the convection of charged molten iron fluids in Earth's outer core.

We may not have found many planetary systems like our own Solar System.