Related Experiment Video
Updated: Aug 5, 2025
12:14
The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
21.8K
Universal Mirror-Stacking Approach for Constructing Topological Bound States in the Continuum.
Luohong Liu1, Tianzi Li1, Qicheng Zhang1
1Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, China.
Physical Review Letters
|March 24, 2023
Summary
Researchers developed a universal mirror-stacking method to create robust topological bound states in the continuum (TBICs) from any topological monolayer. This approach enables precise control over topological bound states, demonstrating their potential in acoustic experiments.
Area of Science:
- Condensed Matter Physics
- Topological Materials Science
- Acoustics
Background:
- Bound states in the continuum (BICs) are localized states within the continuous spectrum.
- Topological BICs (TBICs) offer enhanced robustness against disorder.
- Exploiting band topology enriches BIC physics.
Purpose of the Study:
- To propose a universal method for generating TBICs.
- To demonstrate the creation of 1D and 2D TBICs.
- To experimentally validate the proposed approach using acoustics.
Main Methods:
- A simple mirror-stacking approach applied to topological monolayers.
- Decoupling of the bilayer Hamiltonian into independent subspaces based on mirror parity.
- Tuning interlayer couplings to manipulate topological bound states.
Main Results:
- Successfully transformed nontrivial bound states into TBICs using the mirror-stacking method.
- Demonstrated continuous movement of topological bound states into and out of the continuum without hybridization.
- Experimental realization of 1D and 2D TBICs in acoustic systems.
Conclusions:
- The mirror-stacking approach provides a universal route to generate TBICs.
- This method preserves the topological properties of the original monolayer.
- The findings broaden the applications of topological materials and BICs.
More Related Videos
Related Concept Videos
01:06Divergence and Stokes' Theorems
1.7K
The divergence and Stokes' theorems are a variation of Green's theorem in a higher dimension. They are also a generalization of the fundamental theorem of calculus. The divergence theorem and Stokes' theorem are in a way similar to each other; The divergence theorem relates to the dot product of a vector, while Stokes' theorem relates to the curl of a vector. Many applications in physics and engineering make use of the divergence and Stokes' theorems, enabling us to write...
1.7K
01:18Superposition Theorem
685
The superposition principle is a fundamental concept stating that in a linear circuit, the voltage across (or current through) an element can be determined by summing the individual contributions of each independent source acting in isolation. When dealing with linear circuits containing multiple independent sources, this principle serves as a valuable tool for analysis. To apply the superposition principle effectively, one should focus on a single independent source at a time while...
685
01:28Magnetostatic Boundary Conditions
1.0K
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
1.0K
01:34Woodward–Hoffmann Selection Rules and Microscopic Reversibility
3.2K
Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
3.2K
01:03Atomic Nuclei: Nuclear Spin State Overview
1.0K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
1.0K
01:20Region of Convergence of Laplace Tarnsform
622
The Region of Convergence (ROC) is a fundamental concept in signal processing and system analysis, particularly associated with the Laplace transform. The ROC represents an area in the complex plane where the Laplace transform of a given signal converges, determining the transform's applicability and utility.
Consider a decaying exponential signal that begins at a specific time. When deriving its Laplace transform, the time-domain variable is replaced with a complex variable. This...
Consider a decaying exponential signal that begins at a specific time. When deriving its Laplace transform, the time-domain variable is replaced with a complex variable. This...
622