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    Atom excitation by circularly polarized laser light depends on orbital helicity. Left-handed pulses more easily excite atoms than right-handed ones, creating electron vortex patterns sensitive to pulse sequence.

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    Area of Science:

    • Atomic Physics
    • Quantum Optics
    • Laser-Matter Interactions

    Background:

    • Circularly polarized laser fields induce orbital helicity-dependent atomic excitation.
    • Resonant excitation from ground states is sensitive to the polarization handedness (LCP vs. RCP).

    Purpose of the Study:

    • To numerically demonstrate orbital-helicity-dependent two-photon-resonant excitation in xenon.
    • To show how this excitation leads to photoelectron vortex patterns sensitive to pulse sequence.
    • To enable detection of ring currents and control electron vortex rotational symmetry.

    Main Methods:

    • Numerical simulations of atomic excitation in intense circularly polarized laser fields.
    • Investigation of two-photon-resonant excitation dynamics.
    • Analysis of photoelectron vortex patterns in the polarization plane.

    Main Results:

    • Orbital helicity strongly influences atomic excitation, with left-handed circularly polarized (LCP) pulses being more efficient than right-handed circularly polarized (RCP) pulses.
    • The sequence of counter-rotating circularly polarized pulses in xenon dictates the resulting photoelectron vortex pattern.
    • This sensitivity allows for the detection of quantum state-associated ring currents.

    Conclusions:

    • Orbital-helicity-dependent excitation provides a method to control electron vortex properties.
    • The study demonstrates a novel way to probe quantum states via photoelectron vortex patterns.
    • This research offers insights into controlling light-matter interactions with tailored laser pulses.