Related Experiment Video
Updated: May 24, 2026

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
3D Z-Classified Higher-Order Topological Insulator Induced by Multiple Orbitals
Shi-Feng Li1, Cui-Yu-Yang Zhou1, Yi-Fan Zhu2
1Nanjing University, Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
None:
The emerging ℤ-classified higher-order topological insulators (HOTIs), featuring multiple topological corner states per site, have attracted extensive interest due to their multipole chiral number (MCN) protection and potential for quantum-inspired device engineering. While 2D HOTIs with MCN>1 have been demonstrated on classical platforms, 3D realizations have remained experimentally elusive primarily due to stringent long-range hopping requirements. Here, we present the first experimental realization of 3D Z-classified HOTIs with large MCNs by implementing a synthetic orbital approach through a 3D Su-Schrieffer-Heeger model incorporating degenerate p orbitals. By explicitly incorporating orbital degrees of freedom into the HOTI design, our work enables multidimensional wave control while circumventing conventional hopping limitations. This demonstration of the orbital-engineering paradigm establishes a versatile platform for developing highly integrated acoustic devices.
More Related Videos
13:56Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
Published on: October 12, 2019
14:16Fabrication of Schottky Diodes on Zn-polar BeMgZnO/ZnO Heterostructure Grown by Plasma-assisted Molecular Beam Epitaxy
Published on: October 23, 2018
Related Concept Videos
Valence Bond Theory
Atomic Orbitals
Hybridization of Atomic Orbitals I
Metallic Solids
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
Crystal Field Theory - Octahedral Complexes
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...