Please use this identifier to cite or link to this item:
https://hdl.handle.net/10356/156871
Title: | Higher-order Dirac semimetal in a photonic crystal | Authors: | Wang, Zihao Liu, Dongjue Teo, Hau Tian Wang, Qiang Xue, Haoran Zhang, Baile |
Keywords: | Science::Physics::Optics and light | Issue Date: | 2022 | Source: | Wang, 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-. https://dx.doi.org/10.1103/PhysRevB.105.L060101 | Project: | NRF-CRP23-2019-0007 | Journal: | Physical Review B | Abstract: | The 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. | URI: | https://hdl.handle.net/10356/156871 | ISSN: | 2469-9950 | DOI: | 10.1103/PhysRevB.105.L060101 | DOI (Related Dataset): | 10.21979/N9/TDYIFB | Schools: | School of Physical and Mathematical Sciences School of Electrical and Electronic Engineering |
Research Centres: | Centre for Disruptive Photonic Technologies (CDPT) The Photonics Institute |
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. | Fulltext Permission: | open | Fulltext Availability: | With Fulltext |
Appears in Collections: | EEE Journal Articles SPMS Journal Articles |
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PhysRevB.105.L060101.pdf | 1.09 MB | Adobe PDF | ![]() View/Open |
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