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Can you make matter out of pure electrons?

Daniel and Kelly’s Extraordinary Universe

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The Prediction of the Triangular Lattice

People are focused on 2D electron crystals. People want to see like, can you build a crystal just out of the electric field of these electrons? So that's what people are focusing on. But I guess why are they aiming for these triangle structures? You don't know what's going to happen, right? What makes you think it's going to form into triangle structures if I just throw a bunch of electrons on a tray? Well, that's the prediction from the theory that that's the configuration that would minimize the energy of the arrangement. Remember that forces in the end are always trying to minimize potential.

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