topological material

Is anyone old enough to remember the ad in which two people walking down the street while snacking accidently bump into each other and discover peanut butter on a chocolate bar? Well, it turns out that when physics students run into each other on the street, the result is a quasicrystal with topological properties. The students in question were members of two different labs in two different physics departments who were both out for a stroll on the same street in Tel Aviv – far from Rehovot and the Weizmann Institute. One was experimenting with a new kind of quasicrystalline optical system –…