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 ...

Fig. 1: Schematic picture of the experimental setup showing a Chern insulator (purple) with attached electrodes (gold) and a SQUID magnetometer (shown as a loop on top of the insulator), which allows ...

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 ...

The new work is an effort to make sense of a discovery that was reported earlier this year by a different group of physicists at MIT, led by Assistant Professor Long Ju (Nature, "Fractional quantum ...