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A scanning tunneling microscope was used to position 36 cobalt atoms in an elliptical structure known as a "quantum corral." Electron waves moving in the copper substrate interact both with a magnetic cobalt atom carefully positioned at one of the foci of the ellipse and apparently with a "mirage" of another cobalt atom (that isn't really there) at the other focus. (Courtesy of IBM.)
reported by: Manoharan et al., in Nature, 3 February 2000