Schedule Oct 18, 2000
Physics of "Which Layer?" Uncertainty
Dr. Steven Girvin, ITP & Indiana University
It is now possible to create layers of two-dimensional electron gases in close proximity to each other inside a semiconductor host material. One of the strange features of quantum mechanics is that we can put the electrons into a quantum state in which we are uncertain which of the layers they are in. Such "broken symmetry" or 'interlayer phase coherent' states are energetically favored by the strong Coulomb interactions among the electrons and lead to several different remarkable phenomena. In particular, a close analog of the superconducting Josephson effect has recently been observed experimentally. An elementary introduction to these remarkable developments will be presented.

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