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Nature 453, 866 (12 June 2008) | doi:10.1038/453866a; Published online 11 June 2008

Condensed-matter physics: Paralysed by disorder

Daniel A. Steck1

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In a disordered medium, a quantum particle can literally stop itself in its tracks. This localization phenomenon can be observed directly using the coldest known form of matter, caught in a laser trap.

Those familiar with the game of pachinko — in which, in its simplest incarnation, little balls bounce and cascade chaotically through a regular lattice of pin-like obstacles — have some idea of what a current of electrons goes through when it flows through the ordered crystal lattice of a metallic wire. But now imagine that you are playing quantum pachinko.

  1. Daniel A. Steck is in the Oregon Center for Optics and the Department of Physics, University of Oregon, Eugene, Oregon 97403-1274, USA.
    Email: dsteck@uoregon.edu

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