Abstract
Two-dimensional terahertz spectroscopy on an AlAs/GaAs nanostructure covered by field-enhancing dog-bone resonators shows signatures of coherent optical phonon amplification. Amplification is due to stimulated phonon emission by a terahertz-driven electron current.
Highlights
Amplification of sound in crystalline materials is a hot topic of current research
The first component is resonant to the optical phonons in GaAs
ETHz(t, )]2 with ELO(t, ) being the internal electric field caused by the optical phonon polarization and ETHz(t, ) the field of the THz pulse
Summary
Amplification of sound in crystalline materials is a hot topic of current research. Recent work has concentrated on the stimulated emission of acoustic phonons in the GHz to subTHz frequency range, e.g., of zone-folded acoustic phonons in semiconductor superlattices. Creating a quasi-stationary electron (or hole) distribution with inversion for optical phonons is challenging because of the huge concomitant heat load in the system.
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