Seminars & Lectures
| * TITLE | Coherent Excitonic Matter | ||||||
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| * HOST(Applicant) | |||||||
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| * DATE / TIME | 2004-05-10, 1:30 pm | ||||||
| * PLACE | Bldg 3, Room#201, POSTECH | ||||||
| * ABSTRACT | |||||||
| By shining light on a semiconductor, one creates pairs of electrons and holes that bind together with the Coulomb interaction to make a neutral ``atom'' called an exciton --- the solid state analog of positronium. The possibility that a gas of excitons might undergo Bose-Einstein condensation was raised over 40 years ago, but despite considerable effort and many beautiful experiments, no unequivocal observation has been made. I will discuss some theoretical ideas and experiments in semiconductor systems, and in particular some novel approaches with optical microcavities that make use of the decay of excitons into photons. In this case, the exciton condensate would be a special kind of laser. |
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