There has been continued interest over several decades in the possibility that excitons in semiconductors can condense into a macroscopic phase-coherent state in analogy to Bose-Einstein atomic condensates. Such phase coherence is useful-both atomic condensates and superconducting junctions have already been shown to surpass the sensitivity of existing measurements of local gravitational or magnetic fields. Although excitons are bosons, no clear signatures of the condensation have been seen, due to their strong interaction with phonons and screening charges.

© 2001 Optical Society of America

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