Exciton Condensates are Super!
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Electronic systems can have a type of order in which coherence is spontaneously
established between two distinct groups of electrons. So far this
(particle-hole or exciton condensate) type of order has been found only in
double-layer two-dimensional electron gas systems, and only in certain strong
magnetic field limits. I will review some of the surprising superfluid
transport effects that have already been observed in double-layer exciton
condensates, and speculate on others that may be observable in the future.