Surface-state-related carrier dynamics of GaAs determined by UV-visible pump-probe terahertz spectroscopy - Université Grenoble Alpes
Article Dans Une Revue Applied Physics Letters Année : 2024

Surface-state-related carrier dynamics of GaAs determined by UV-visible pump-probe terahertz spectroscopy

Résumé

The surface velocity and the bulk lifetime of photo-excited free carriers in GaAs were measured using an optical-pump and THz-probe time-domain technique. By varying the pump laser photon energy from 1.56 to 4.15 eV, we observe that the surface velocity drops abruptly from 0.7×106 cm/s down to 0.2×106 cm/s at 2.5 eV, while the bulk lifetime remains almost constant. We tentatively explain this step-like behavior of the surface velocity vs the photon energy by a trapping of the free carriers at surface states, whose density of states shows a maximum at 2.5 eV.
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Dates et versions

hal-04742310 , version 1 (17-10-2024)

Identifiants

Citer

D. Zhai, E. Hérault, F. Garet, J.-L. Coutaz. Surface-state-related carrier dynamics of GaAs determined by UV-visible pump-probe terahertz spectroscopy. Applied Physics Letters, 2024, 124 (16), ⟨10.1063/5.0198347⟩. ⟨hal-04742310⟩
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