Category Physics

>>could improve Med Imaging/ Cancer Rx’s + Increase Solar Cell efficency by 25 – 30%. Goal is to turn low-energy colors of light, such as red, into higher-energy colors, like blue/green. A traditional solar cell can only absorb light with energy above a certain threshold. Infrared light passes right through, its energy untapped. But if low-energy could be transformed into higher-energy light, a solar cell could absorb more.

UD’s College of Engineering’s A/Prof Matthew Doty said; “You can’t simply turn a red photon into a blue one, but you can combine the energy from two or more red photons to make one blue photon.” …”Photon upconversion” isn’t new but UD team’s approach is. They want to design a new kind of semiconductor nanostructure that will act like a ratchet...

The magnetic moments of the three organic molecules and the cobalt surface align very stably relative to each other.
Credit: M. Gruber, KIT

A thin layer of organic molecules can stabilize the magnetic orientation of a cobalt surface. “This special interaction between organic molecules and metal surfaces could help to manufacture information storage systems in a more simple, flexible and cheaper way,” explains Wulf Wulfhekel from KIT. Microscopic magnets with constant orientation are used in hard disks, for example. With a view to “printable electronics,” organic molecules indeed could open up new simple production methods utilizing the self-organization of molecules.

METHOD: 3 molecular layers of the dye phtalocynine were applied to the surface of ferromagnetic cobalt...

Electroluminescence from vertically stacked GaN–Al2O3–MoS2–Al2O3-graphene heterostructures.

1st demo of electroluminescence from multilayer molybdenum disulfide, or MoS2, a discovery that could lead to a new class of materials for making LEDs. In its single-layer form, Mos2 is optically active, meaning that it emits light when electric current is run through it or when it is shot with a nondestructive laser. Multilayer molybdenum disulfide, by contrast, is easier and less expensive to produce, but it is not normally luminescent. In the new study, Duan and Dehui, created the 1st multilayer device that shows strong luminescence when electrical current is passed through it.

“It was rather surprising for us to discover that similar vertical devices made of multilayer MoS2 somehow showed ...

Weyl fermions could give rise to faster and more efficient electronics because of their unusual ability to behave as matter and antimatter inside a crystal. They could allow for a nearly free and efficient flow of electricity in electronics, and thus greater power, especially for computers.

Proposed by mathematician/ physicist Hermann Weyl in 1929, Weyl fermions have been long sought by scientists because they have been regarded as possible building blocks of other subatomic particles, and are even more basic than electrons (when electrons are moving inside a crystal). Their basic nature means that Weyl fermions could provide a much more stable and efficient transport of particles than electrons, which are the principle particle behind modern electronics...