http://www.physorg.com/news169129727.html
$this->bbcode_second_pass_quote('', 'T')his effect is typically only observed when a two-dimensional semiconductor is subjected to an extraordinarily strong magnetic field at low temperatures. But in the unusual, three-dimensional crystals developed at Princeton, it occurs spontaneously because the electrons are traveling so close to the speed of light that, according to the theory of relativity, they effectively generate their own magnetic field. In this scenario, the quantum Hall effect dictates that the electrons are able to flow freely on the outside of the crystal, but not through it. The result: an insulator with surfaces that conduct electricity.







