Video Experimental Relacionado
Updated: Jan 8, 2026
09:00
Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
10.4K
Twist-Induced All-Flat-Band Higher-Order Acoustic Topological Insulator
Min-Hang Ling1, Peng Wu1, Yu-Gui Peng1
1School of Physics and Innovation Institute, Huazhong University of Science and Technology, Wuhan, China.
Advanced materials (Deerfield Beach, Fla.)
|December 24, 2025
Resumen
Los investigadores desarrollaron un novedoso aislante topológico acústico utilizando superredes Moiré retorcidas (TMS) con resonancias localizadas. Este diseño logra una topología de banda plana completa, permitiendo estados de borde, esquina y bisagra para aplicaciones avanzadas.
Área de la Ciencia:
- Acústica
- Física de la Materia Condensada
- Ciencia de Materiales
Sus antecedentes:
- Las superredes Moiré retorcidas (TMS) son conocidas por su periodicidad única y dispersión de Bragg, utilizadas en la ingeniería de bandas planas.
- Lograr una topología de banda plana completa con modos propios Moiré intrínsecos sigue siendo un área poco explorada.
Objetivo del estudio:
- Proponer un novedoso aislante topológico de orden superior de banda plana acústica.
- Investigar el mecanismo para lograr una topología de banda plana completa en superredes Moiré acústicas.
Principales métodos:
- Introducción de resonancias localizadas fuertes y periódicas en superredes Moiré.
- Utilización del efecto de onda estacionaria de las resonancias de Mie multipolares.
- Apilamiento de TMS acústicas en una configuración 3D.
Principales resultados:
- Observación de estados de borde de frecuencia variada y estados de esquina de alta calidad (alto Q) dentro de brechas de banda topológicas de banda plana completa.
- Demostración de estados de bisagra topológicos fuera de fase en una configuración 3D.
- Construcción exitosa de un aislante topológico acústico de banda plana completa.
Conclusiones:
- Se presenta una estrategia simple para construir aislantes topológicos acústicos de banda plana completa.
- El sistema propuesto ofrece potencial para aplicaciones en recolección de energía y detección.
- Las resonancias localizadas son clave para lograr las propiedades topológicas deseadas en sistemas Moiré acústicos.
Videos de Conceptos Relacionados
02:42Valence Bond Theory
11.1K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.1K
01:28Induced Electric Dipoles
4.7K
A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
4.7K
01:17Theory of Metallic Conduction
1.7K
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
1.7K
01:13Angle of Twist - Elastic Range
725
Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
725
02:35Band Theory
16.9K
When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
16.9K
01:18Unsymmetric Bending
750
Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from those in symmetrical bending, and are essential for designing structures to withstand different loading conditions. In unsymmetrical bending, the neutral axis—where stress is zero—does not necessarily align with the geometric axes of the cross-section. The...
750