Dynamics of Photoexcited GaAs Band-Edge Absorption with Subpicosecond Resolution
- 8 January 1979
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 42 (2) , 112-115
- https://doi.org/10.1103/physrevlett.42.112
Abstract
Time-resolved measurements of optically induced changes in the near-band-gap transmission spectrum of GaAs at 80°K, following excitation with an ultrashort laser pulse, provide a means of directly monitoring the hot-carrier distribution as it cools to the lattice temperature with a time constant of 4 psec. Exciton screening and band-gap renormalization are observed to occur in less than 0.5 psec.Keywords
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