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Videos de Conceptos Relacionados

Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
Damped Oscillations01:07

Damped Oscillations

In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
Equipotential Surfaces and Conductors01:16

Equipotential Surfaces and Conductors

For a conductor in which all charges are at rest, the conductor's surface is equipotential. The electric field is always perpendicular to equipotential surfaces. Therefore, in a conductor with static charges, the electric field just outside the conductor is always perpendicular to the conductor's surface. Any tangential component of the electric field will cause charges to move inside the conductor, which will violate the electrostatic nature of the system. In an electrostatic situation, if a...
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
Limits with Oscillating Discontinuities01:19

Limits with Oscillating Discontinuities

An oscillating discontinuity is a type of discontinuity in which a function’s values fluctuate infinitely often as the input approaches a particular point. Unlike jump discontinuities, where the function suddenly shifts between two values, or infinite discontinuities, where the function diverges without bound, an oscillating discontinuity arises from rapid back-and-forth variation. Because the function never stabilizes toward a single value, no finite limit exists at that point.One of the most...

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Video Experimental Relacionado

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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Generación de alta armonía ajustable no entera en un aislante topológico

C P Schmid1, L Weigl1, P Grössing2

  • 1Institute of Experimental and Applied Physics, University of Regensburg, Regensburg, Germany.

Nature
|May 20, 2021
PubMed
Resumen

Los investigadores generaron radiación armónica de alto orden en aislantes topológicos, observando efectos de superficie únicos y cambios de frecuencia controlables. Esto abre las puertas para explorar la topología y desarrollar nuevos dispositivos electrónicos.

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Área de la Ciencia:

  • Física de la materia condensada
  • La óptica cuántica
  • Ciencias de los materiales

Sus antecedentes:

  • La generación armónica de alto orden (HH) revela la dinámica de electrones en sólidos bajo luz intensa.
  • Se prevé que los materiales topológicos exhiban una generación de HH no convencional debido a sus propiedades electrónicas únicas.

Objetivo del estudio:

  • Demostrar y caracterizar experimentalmente la generación de HH en un aislante topológico 3D.
  • Investigar el papel de los estados topológicos de la superficie en la emisión de HH.
  • Explorar aplicaciones potenciales en la electrónica topológica.

Principales métodos:

  • Demostración experimental de la generación de HH utilizando campos de terahertz intensos en el telururo de bismuto.
  • Análisis de los espectros de HH para distinguir entre contribuciones masivas y superficiales.
  • Investigación de los efectos de la fase de envoltura portadora en la emisión de HH.

Principales resultados:

  • Generación exitosa de HH observada en un aislante topológico 3D (telururo de bismuto).
  • Generación distinta de HH a partir de estados de superficie topológicos, mejorada por el bloqueo del momento de giro y la dispersión cuasi-relativista.
  • Cambio continuo de las órdenes HH mediante la variación de la fase del campo de conducción.
  • Los patrones de polarización observados son consistentes con la curvatura anómala de Berry y las trayectorias serpenteantes de fermiones Dirac.

Conclusiones:

  • Los aislantes topológicos proporcionan una plataforma única para estudiar la física y la topología de campos fuertes.
  • Los hallazgos sugieren el potencial para la electrónica topológica no disipadora que funciona en frecuencias infrarrojas.