[26a-E303-1~10] 3.11 Photonic structures and phenomena

▲ [26a-E303-8] Topological Edge States in Biphenylene Photonic Crystals

〇ThanhHuyen Phan¹, Keiki Koizumi¹, Feng Liu², Katsunori Wakabayashi¹ (1.Kwansei Gakuin University, 2.Ningbo University)

Keywords:Photonic Crystals

The searching of two-dimensional (2D) carbon allotropes other than graphene, such as biphenylene (BPN) or graphenylene network, has stimulated and brought a new insight for electronic transport properties in nanoscale materials. In recent research, Fan et al. has successfully synthesized the 2D BPN network [Fan et al., Science, 372, 852-856 (2021)]. Followed by this experimental results, A. Bafekry et al. has performed the detailed of density functional theory-based first-principles calculations to deeply study the electronic and optical properties of this material [A. Bafekry et al., J. Phys.: Condens. Matter 34 015001 (2021)]. These research results pave the way to the study of this new promising nanomaterial.In our work, inspired from the study of 2D BPN network, we first time introduce a photonic crystal structure following the BPN network structure, so-call BPN photonic crystal. Both finite-element and plane wave expansion method are used to evaluate photonic band structure and topological invariants. Our research findings indicate that the topological edge states can be found in both zigzag and armchair ribbons due to the non-trivial Zak’s phase in the corresponding directions. Moreover, even in the absence of C3 symmetry, we found the topological k-dependent edge states in zigzag ribbon. The results suggest a new platform of the application of topological edge states in photonic crystals devices.