An Atomic View of Quantum Phase Transitions -- DeMarco 329 (5991): 523 -- Science: An artificial solid is created in optical lattice experimentsby first cooling atoms trapped as a gas in ultrahigh vacuumto nanokelvin temperatures (3). The atoms are twhen capturedin a lattice that is created by slowly turning on a combinationof laser beams. The atoms play the role of the electrons orsuperconducting pairs of electrons in a solid, whereas the lightsubstitutes for the underlying ionic crystal. Different crystalgeometries can be produced depending on the arrangement of thelasers. The holographic technique used by Bakr et al. to createa square lattice is especially powerful because it can, in principle,produce any two-dimensional crystal geometry."