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VOLUME 65 (1997) | ISSUE 2 | PAGE 164
Inflating antenna: Dynamics of exciton wave packets
A theory of the free induction signal from biexcitons and bound excitons is presented. Simultaneous existence of the exciton continuum and a bound state is shown to result in a new type of the time dependence of the free induction. Optically detected signal increases in time and oscillates with increasing amplitude until damped by radiative and dephasing processes. Expanding area of a coherent exciton polarization (inflating antenna), produced by the exciting pulse, is the underlying physical mechanism. Developed formalism can be applied to different biexciton transients. PACS: 42.50.-p, 71.35.-y