The electrical conductance of a short and narrow conducting channel is quantized in units of 2e2/h, a team of experimenters from the Netherlands recently reported. The effect was independently observed by experimenters at Cambridge University at much the same time as its discovery by the Dutch group. In the new effect the conductance of the channel, which connects two‐dimensional reservoirs of electrons, remains constant at an integral multiple of 2e2/h for a range of channel widths but jumps sharply to the next higher integral multiple of 2e2/h at some critical values of the width.

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