Realization of photonic
p -orbital higher-order topological insulatorsRealization of photonic
p -orbital higher-order topological insulators- Affiliations：
The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Applied Physics Institute and School of Physics, Nankai University, Tianjin 300457, China
INRS-EMT, 1650 Blvd. Lionel-Boulet, Varennes, QC J3X 1S2, Canada
Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, Shanxi, China
Faculty of Civil Engineering, University of Zagreb, A. Kačića Miošića 26, 10000Zagreb, Croatia
Department of Physics, Faculty of Science, University of Zagreb, Bijenička C. 32, 10000Zagreb, Croatia
- Author bio：
*Hrvoje Buljanhbuljan@phy.hr
Zhigang Chenzgchen@nankai.edu.cn
- Funds：
DOI：10.1186/s43593-022-00039-7
中图分类号：纸质出版日期：2023，
网络出版日期：2023-03-13，
收稿日期：2022-10-13，
修回日期：2022-12-26，
录用日期：2022-12-29
- Accepted：
Scan QR Code
Realization of photonic
p -orbital higher-order topological insulators[J]. 光：快讯（英文）, 2023,3(1).Yahui Zhang, Domenico Bongiovanni, Ziteng Wang, et al. Realization of photonic
p -orbital higher-order topological insulators[J]. eLight, 2023,3(1).Realization of photonic
p -orbital higher-order topological insulators[J]. 光：快讯（英文）, 2023,3(1). DOI： 10.1186/s43593-022-00039-7.Yahui Zhang, Domenico Bongiovanni, Ziteng Wang, et al. Realization of photonic
p -orbital higher-order topological insulators[J]. eLight, 2023,3(1). DOI： 10.1186/s43593-022-00039-7.
摘要
Abstract
The orbital degrees of freedom play a pivotal role in understanding fundamental phenomena in solid-state materials as well as exotic quantum states of matter including orbital superfluidity and topological semimetals. Despite tremendous efforts in engineering synthetic cold-atom
as well as electronic and photonic lattices to explore orbital physics
thus far high orbitals in an important class of materials
namely
higher-order topological insulators (HOTIs)
have not been realized. Here
we demonstrate p-orbital corner states in a photonic HOTI
unveiling their underlying topological invariant
symmetry protection
and nonlinearity-induced dynamical rotation. In a Kagome-type HOTI
we find that the topological protection of p-orbital corner states demands an orbital-hopping symmetry in addition to generalized chiral symmetry. Due to orbital hybridization
nontrivial topology of the p-orbital HOTI is "hidden" if bulk polarization is used as the topological invariant
but well manifested by the generalized winding number. Our work opens a pathway for the exploration of intriguing orbital phenomena mediated by higher-band topology applicable to a broad spectrum of systems.
关键词
Keywords
Higher-band topologyOrbital degrees of freedomGeneralized chiral symmetryBulk polarizationWinding numberBreathing Kagome lattice
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