Ultrafast quantum-path interferometry of photo-absorption involving excitons in a GaAs multiple-quantum-well structure

Using a pump–probe protocol with pairs of relative-phase-locked femtosecond pulses, we gathered transient reflectivity measurements from a multiple quantum well structure of GaAs/Al0.3Ga0.7As at 10 K. Quantum beating between heavy-hole and light-hole excitons was observed as an oscillation in the tr...

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Bibliographic Details
Published in:Solid state communications 2023-02, Vol.360, p.115056, Article 115056
Main Authors: Furusho, Yuya, Yagi, Ryoko, Suda, Masaki, Maruhashi, Tsukasa, Takagi, Itsuki, Kayanuma, Yosuke, Minami, Fujio, Nakamura, Kazutaka G.
Format: Article
Language:English
Subjects:
Coherent control
Exciton quantum beat
Femtosecond pulse
Nonlinear optics
Semiconductor quantum well
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Summary:Using a pump–probe protocol with pairs of relative-phase-locked femtosecond pulses, we gathered transient reflectivity measurements from a multiple quantum well structure of GaAs/Al0.3Ga0.7As at 10 K. Quantum beating between heavy-hole and light-hole excitons was observed as an oscillation in the transient reflectivity. Its intensity was coherently controlled by controlling the delay between two successive pump pulses. We found characteristic interference fringes arising from the interference of the photo-induced excitons traversing entangled quantum paths. As established in theory, these fringes are peculiar to this dual-pulse excitation via photo-absorption. •Exciton quantum beats were observed using transient reflectivity.•Quantum-beat amplitude was coherently controlled by phase-locked femtosecond pulses.•Quantum-path interference fringes showed characteristic features of photo-absorption.
ISSN:0038-1098
1879-2766
DOI:10.1016/j.ssc.2022.115056