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dc.contributor.authorWang, Zihaoen_US
dc.contributor.authorLiu, Dongjueen_US
dc.contributor.authorTeo, Hau Tianen_US
dc.contributor.authorWang, Qiangen_US
dc.contributor.authorXue, Haoranen_US
dc.contributor.authorZhang, Baileen_US
dc.identifier.citationWang, Z., Liu, D., Teo, H. T., Wang, Q., Xue, H. & Zhang, B. (2022). Higher-order Dirac semimetal in a photonic crystal. Physical Review B, 105(6), L060101-.
dc.description.abstractThe recent discovery of higher-order topology has largely enriched the classification of topological materials. Theoretical and experimental studies have unveiled various higher-order topological insulators that exhibit topologically protected corner or hinge states. More recently, higher-order topology has been introduced to topological semimetals. Thus far, realistic models and experimental verifications on higher-order topological semimetals are still very limited. Here we design and demonstrate a three-dimensional photonic crystal that realizes a higher-order Dirac semimetal phase. Numerical results on the band structure show that the designed three-dimensional photonic crystal is able to host two fourfold Dirac points, which are connected in the momentum-space projections via higher-order hinge states localized at the hinge. The higher-order topology can be characterized by the topological invariant χ(6) at different values of k_z . An experiment at microwave frequencies is also presented to measure the hinge state dispersion. Our work demonstrates the physical realization of a higher-order Dirac semimetal phase and paves the way to explore higher-order topological semimetal phases in three-dimensional photonic systems.en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.relation.ispartofPhysical Review Ben_US
dc.rights© 2022 American Physical Society. All rights reserved. This paper was published in Physical Review B and is made available with permission of American Physical Society.en_US
dc.subjectScience::Physics::Optics and lighten_US
dc.titleHigher-order Dirac semimetal in a photonic crystalen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen_US
dc.contributor.schoolSchool of Electrical and Electronic Engineeringen_US
dc.contributor.researchCentre for Disruptive Photonic Technologies (CDPT)en_US
dc.contributor.researchThe Photonics Instituteen_US
dc.description.versionPublished versionen_US
dc.subject.keywordsPhotonic Crystalsen_US
dc.subject.keywordsTopological Insulatorsen_US
dc.description.acknowledgementThis work is supported by National Research Foundation Singapore Competitive Research Program No. NRF-CRP23-2019-0007.en_US
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