How to Make Electron Crystals

People have been playing with this kind of thing for a long time and they suspected that they were electron crystals being formed. People were trying to use things like scanning tunneling microscopes to see these electron crystals. But the problem with that is that you're basically using electrons to prove it. And as soon as you like zap it, it just breaks the crystal. You need something which has really high spatial resolution, but also somehow doesn't perturb the electron lattice. Those two requirements were like a conflict with each other. So they needed to come up with a special trick to be able to see whether they were making These electron crystals.