Free Republic

Scientists report the first known observation of a variety of quasiparticle that exhibits a very peculiar behavior: it appears to have mass, but only while moving in one direction. Scientists at Pennsylvania State University recently succeeded in detecting the unusual quasiparticle while conducting studies involving a semi-metallic crystalline material. Known as a semi-Dirac fermion, this unique formation of particles was first theorized more than a decade ago, but until now had never been directly observed. The discovery potentially paves the way toward future advances in a range of emerging technologies that include power storage and novel forms of sensor technologies....

May 8 (UPI) -- The study of a unique crystalline material, composed of aluminum and platinum atoms, has revealed a pair of electronic properties that have never been seen before. The atoms in the new materials are crystallized in a special pattern, with each row offset from the other. The pattern creates a spiral staircase of aluminum and platinum atoms. According to the new study, published this week in the journal Nature Physics, the material's unique crystalline structure produces Rarita-Schwinger fermions in its interior and extremely long quadruple topological Fermi arcs on its surface. Rarita-Schwinger fermions are a type of...