Premium
Coherent THz Plasmons in GaAs: Transition from “Pure” Plasmons to Coupled Plasmon–Phonon Modes
Author(s) -
Bratschitsch R.,
Fischler W.,
Höpfel R.,
Zandler G.
Publication year - 1997
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(199711)204:1<64::aid-pssb64>3.0.co;2-9
Subject(s) - plasmon , terahertz radiation , femtosecond , phonon , heterojunction , oscillation (cell signaling) , condensed matter physics , surface plasmon , materials science , optoelectronics , physics , modulation (music) , monte carlo method , optics , laser , chemistry , acoustics , statistics , mathematics , biochemistry
We report on the observation of coherent THz plasmons in GaAs using the femtosecond time‐resolved pump–probe technique. The samples are GaAs/AlGaAs modulation doped single heterostructures with a depletion field below the 2D‐channel in the intrinsic GaAs substrate. For the first time, several coherent oscillations (up to five full periods) are clearly visible in the frequency range of 1.5 to 5 THz. The observed oscillation frequencies increase with increasing carrier densities. Our experimental data are in good agreement with theoretical Ensemble‐Monte‐Carlo simulations.