Trying to solve quantum gravity is frustrating. We have made tremendous progress in quantum theory, but it seems that every ...

The quantum Hall effect, a fundamental effect in quantum mechanics, not only generates an electric but also a magnetic current. It arises from the motion of electrons on an orbit around the nuclei of ...

Scientists at the University of Würzburg and the German national metrology institute (PTB) have carried out an experiment that realizes a new kind of quantum standard of resistance. It's based on the ...

Until now, the zero magnetic field Quantum Anomalous Hall effect only occurred at very low currents. This device can change that. The precise measurement of electrical resistance is essential in ...

(a) Schematics of the A-A stacking hexagonal lattice. (b) First Brillouin zone and the distribution of the Weyl points. The arrows show their shifts direction by changing the on-site energies of A and ...