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    Area of Science:

    • Condensed Matter Physics
    • Photonics
    • Materials Science

    Background:

    • Weyl points are crucial degeneracies in band structures, extensively studied in electronic and wave systems.
    • Previous realizations of Weyl points often required complex lattice structures.
    • Terahertz (THz) frequencies offer potential for advanced wireless communication and sensing applications.

    Purpose of the Study:

    • To investigate and demonstrate frequency-tunable terahertz generalized Weyl points.
    • To explore the use of a specially designed photonic crystal incorporating liquid crystals for Weyl point manipulation.
    • To observe signatures of generalized Weyl points and interface states.

    Main Methods:

    • Design and numerical simulation of a photonic crystal composed of polydimethylsiloxane (PDMS) and 5CB liquid crystals (LCs).
    • Investigation of band structures to identify generalized Weyl points.
    • Analysis of reflective phase vortices as a signature for Weyl points.
    • Exploration of tuning Weyl point frequencies via external magnetic fields to alter LC molecule orientation.

    Main Results:

    • Successful identification and simulation of frequency-tunable terahertz generalized Weyl points.
    • Observation of reflective phase vortices, confirming the presence of generalized Weyl points.
    • Demonstration of interface states between the photonic crystal and reflective substrates.
    • Tuning of the Weyl point frequency from 0.27698 THz to 0.30013 THz by adjusting LC orientation with a magnetic field.

    Conclusions:

    • The proposed photonic crystal design enables the realization and frequency tuning of terahertz generalized Weyl points.
    • The observed phenomena, including reflective phase vortices and tunable Weyl points, are significant for fundamental physics.
    • This work provides a promising platform for applications in short-range wireless communication and the study of localized states.