Identifying the Distinct Phases of Carrier Transport in Semiconductors with 10 fs Resolution
- 27 February 1995
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 74 (9) , 1689-1692
- https://doi.org/10.1103/physrevlett.74.1689
Abstract
We study the very early processes of photogenerated carrier transport in GaAs and Si using THz nonlinear spectroscopy with 10 fs time resolution. This ultrahigh time resolution allows us to clearly separate the instantaneous creation of polarized electron-hole pairs and the subsequent carrier motion for the first time. In addition, our results give the first clear demonstration of the distinct phases of carrier transport; ballistic transport, electron velocity overshoot, and steady-state drift.Keywords
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