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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Inter-half-cycle spectral interference in high-order harmonic generation from monolayer MoS2.

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    Summary

    Even-order harmonics in monolayer MoS2 spectra are enhanced due to spectral interference. Quantum calculations show that only same-polarity half-cycles generate these harmonics, preventing destructive interference and boosting even-order signals.

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    Area of Science:

    • Condensed Matter Physics
    • Quantum Optics
    • Materials Science

    Background:

    • Recent experiments observed enhanced even-order harmonics near the cut-off in high-order harmonic spectra from monolayer MoS2.
    • Understanding this phenomenon is crucial for controlling light-matter interactions in novel materials.

    Purpose of the Study:

    • To provide a quantum mechanical explanation for the enhancement of even-order harmonics in monolayer MoS2.
    • To elucidate the role of spectral interference in high-harmonic generation (HHG) from non-centrosymmetric materials.

    Main Methods:

    • Utilized fully quantum mechanical calculations.
    • Analyzed spectral interference between half-cycles of laser fields.
    • Investigated the influence of Berry connections on electron dynamics.

    Main Results:

    • Demonstrated that spectral interference between opposite polarity half-cycles explains the harmonic enhancement.
    • Showed that energy modulation by Berry connections allows only same-polarity half-cycles to generate cut-off harmonics.
    • Identified a lack of destructive interference as the cause for enhanced even-order harmonics.

    Conclusions:

    • The study reveals that inter-half-cycle interference plays a significant role in HHG from non-centrosymmetric materials like MoS2.
    • The findings offer a new perspective on controlling HHG spectra by manipulating electron dynamics through material properties.