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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
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Un nuevo Hall para la protección cuántica

Angel Rubio1,2

  • 1Max Planck Institute for the Structure and Dynamics of Matter and Center for Free-Electron Laser Science, Luruper Chaussee 149, 22761 Hamburg, Germany.

Science (New York, N.Y.)
|March 3, 2022
PubMed
Resumen
Este resumen es generado por máquina.

Las fluctuaciones de vacío de largo alcance interrumpen la protección topológica del efecto Hall cuántico entero. Este hallazgo desafía la robustez de este estado cuántico contra el ruido ambiental.

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Área de la Ciencia:

  • Física de la materia condensada
  • Teoría del campo cuántico

Sus antecedentes:

  • El efecto Hall cuántico entero (IQHE) es un estado topológico de la materia caracterizado por una conductancia Hall robusta y cuantizada.
  • Se cree que la protección topológica en IQHE protege sus propiedades de las perturbaciones locales.

Objetivo del estudio:

  • Investigar el impacto de las fluctuaciones de vacío de largo alcance en la protección topológica del efecto Hall cuántico entero.
  • Determinar si el ruido ambiental puede desestabilizar la conductancia cuantizada observada en IQHE.

Principales métodos:

  • Análisis teórico que emplea técnicas de la teoría cuántica de campos.
  • Modelado de las fluctuaciones de vacío de largo alcance y su interacción con el gas de electrones 2D en el régimen IQHE.

Principales resultados:

  • Demostró que las fluctuaciones de vacío de largo alcance pueden romper la protección topológica del efecto Hall cuántico entero.
  • Se demostró que estas fluctuaciones pueden conducir a una ruptura de la conductividad de Hall cuantizada.

Conclusiones:

  • La protección topológica del efecto Hall cuántico entero no es absoluta y puede verse comprometida por factores ambientales como las fluctuaciones del vacío.
  • Esta investigación pone de relieve la importancia de considerar el ruido ambiental para comprender y mantener los estados topológicos cuánticos.