RT Journal Article
T1 Pseudospin induced topological corner state at intersecting sonic lattices
A1 Zhang, Zhiwang
A1 Hu, Bolun
A1 Liu, Feng
A1 Cheng, Ying
A1 Liu, Xiaojun
A1 Christensen, Johan
AB Inspired by the discoveries of electronic topological phases and topological insulators, topologically protected boundary states in classical wave-based systems have attracted considerable interest in the last decade. Most recently, acoustic higher-order topological insulators and Kekulé-distorted sonic lattices have been proposed to support topological corner states and zero-dimensional bound states. Here, we demonstrate a domain wall induced topological corner state that is bound at the crossing point among finite acoustic graphenelike crystals. The approach is based on designing multipolar pseudospin resonances, which give rise to topologically trivial and nontrivial transitions across the domain walls that flank this unusual corner excitation toward the crossing point. By deliberately adding a substantial amount of defects into the cavities of the sonic lattice, we find that the pseudospin induced topological corner state remains entirely unaffected and pinned spectrally to the complete audible band gap. Our findings may thus have the potential to broaden the possibilities for sound confinement and focusing.
PB American Physical Society
SN 1098-0121
YR 2020
FD 2020-06-02
LK https://hdl.handle.net/10016/31576
UL https://hdl.handle.net/10016/31576
LA eng
NO This work was supported by National Key R&D Program of China (Grant No. 2017YFA0303702), NSFC (Grants No. 11922407, No. 11834008, No. 11874215, and No. 11674172), Jiangsu Provincial NSF (BK20160018) and the Fundamental Research Funds for the Central Universities (Grant No. 020414380001). J.C. acknowledges the support from the European Research Council (ERC) through the Starting Grant No. 714577 PHONOMETA and from the MINECO through a Ramón y Cajal grant (Grant No. RYC-2015-17156).
DS e-Archivo
RD 27 jul. 2024