Ultrafast Quantum-path Interferometry Revealing the Generation Process of Coherent Phonons

Optical dual-pulse pumping actively creates quantum-mechanical superposition of the electronic and phononic states in a bulk solid. We here made transient reflectivity measurements in an n-GaAs using a pair of relative-phase-locked femtosecond pulses and found characteristic interference fringes. Th...

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Bibliographic Details
Published inarXiv.org
Main Authors Nakamura, Kazutaka G, Yokota, Kensuke, Okuda, Yuki, Kase, Rintaro, Kitashima, Takashi, Mishima, Yu, Shikano, Yutaka, Kayanuma, Yosuke
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 20.05.2019
Subjects
Coherent scattering
Femtosecond pulses
Interference fringes
Optical pumping
Phonons
Physics - Chemical Physics
Physics - Mesoscale and Nanoscale Physics
Physics - Quantum Physics
Raman spectra
Superposition (mathematics)
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Summary:Optical dual-pulse pumping actively creates quantum-mechanical superposition of the electronic and phononic states in a bulk solid. We here made transient reflectivity measurements in an n-GaAs using a pair of relative-phase-locked femtosecond pulses and found characteristic interference fringes. This is a result of quantum-path interference peculiar to the dual-pulse excitation as indicated by theoretical calculation. Our observation reveals that the pathway of coherent phonon generation in the n-GaAs is impulsive stimulated Raman scattering at the displaced potential due to the surface-charge field, even though the photon energy lies in the opaque region.
ISSN:2331-8422
DOI:10.48550/arxiv.1905.08362