Scientists at the U.S. Naval Research Laboratory (NRL) have reported the first direct comparison of the spin polarization generated in the topologically protected Dirac states of a topological insulator (TI) bismuth selenide (Bi2Se3) and the trivial 2-dimensional electron gas (2DEG) states at the surface of indium arsenide (InAs).
When chemists include some theory in their papers, it usually means that they will perform some quantum-chemical calculations of the participating molecules. This generally means solving a series of extremely complex equations describing the motion of electrons around atomic nuclei to target the energies of the starting molecules and the products.
(Phys.org)—Physicists have performed a variation of the famous 200-year-old double-slit experiment that, for the first time, involves "exotic looped trajectories" of photons. These photons travel forward through one slit, then loop around and travel back through another slit, and then sometimes loop around again and travel forward through a third slit.
Theoretical physicists at the Department of Energy's SLAC National Accelerator Laboratory used computer simulations to show how special light pulses could create robust channels where electricity flows without resistance in an atomically thin semiconductor.
All ferroelectric materials possess a property known as piezoelectricity in which an applied mechanical force can generate an electrical current and an applied electrical field can elicit a mechanical response. Ferroelectric materials are used in a wide variety of industrial applications, from ultrasound and sonar to capacitors, transducers, vibration sensors and ultrasensitive infrared cameras.
Olympic figure skaters and electrons have a lot in common. In figure skating competitions, the "free skate" segment gives the skater the flexibility to travel in whichever pattern he or she chooses around the rink. Similarly, in metals, electrons in outer orbitals can wander fairly freely.
The Pittsburgh Quantum Institute was established in 2012 to help unify and promote research in quantum science and engineering in the Pittsburgh area. PQI members have faculty appointments from Carnegie Mellon University, Duquesne University, and the University of Pittsburgh in physics, chemistry, and engineering disciplines.