Realization of photonic <italic style="font-style: italic">p</italic>-orbital higher-order topological insulators

Yahui Zhang; Domenico Bongiovanni; Ziteng Wang; Xiangdong Wang; Shiqi Xia; Zhichan Hu; Daohong Song; Dario Jukić; Jingjun Xu; Roberto Morandotti; Hrvoje Buljan; Zhigang Chen

doi:10.1186/s43593-022-00039-7

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Realization of photonic p-orbital higher-order topological insulators

eLight Vol. 3, Issue 1, (2023)

LETTER | Updated：2024-09-25

- Realization 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
  CLC：
- Published：2023，
  
  Published Online：13 March 2023，
  
  Received：13 October 2022，
  
  Revised：26 December 2022，
  
  Accepted：29 December 2022
- Accepted：
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Yahui Zhang, Domenico Bongiovanni, Ziteng Wang, et al. Realization of photonic p-orbital higher-order topological insulators. [J]. eLight, 2023,3(1).
DOI：

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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Realization of photonic p-orbital higher-order topological insulators

DOI：10.1186/s43593-022-00039-7

摘要

Abstract

关键词

Keywords

references