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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Un filtro de espín bidireccional controlado por puertas que utiliza coherencia cuántica.

J A Folk1, R M Potok, C M Marcus

  • 1Department of Physics, Harvard University, Cambridge, MA 02138, USA. jfolk@stanford.edu

Science (New York, N.Y.)
|February 1, 2003
PubMed
Resumen
Este resumen es generado por máquina.

Desarrollamos un filtro de espín de electrones coherente cuántico utilizando un punto cuántico y un campo magnético. Este dispositivo controla eléctricamente y detecta corrientes polarizadas de espín con una alta polarización de hasta el 70%.

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Área de la Ciencia:

  • La física cuántica es la física cuántica.
  • Física de la materia condensada Física de la materia condensada Física de la materia condensada Física de la materia condensada Física de la materia condensada
  • Spintronics es una empresa de Spintronics.

Sus antecedentes:

  • La polarización del espín de los electrones es crucial para las tecnologías cuánticas.
  • Los métodos actuales para la manipulación de espín a menudo carecen de un control eléctrico completo.

Objetivo del estudio:

  • Para demostrar un nuevo filtro de espín de electrones coherentes cuánticos.
  • Para lograr el control totalmente eléctrico y la detección de corrientes polarizadas de espín.

Principales métodos:

  • Utilizó un punto cuántico abierto sometido a un campo magnético en el plano.
  • Se explotó la interferencia cuántica dependiente del giro y el ajuste de la tensión de la puerta.
  • Se midió directamente la polarización de espín de la corriente emitida.

Principales resultados:

  • Se logró una interferencia cuántica dependiente del espín a través de longitudes de onda de Fermi controladas.
  • Selección eléctrica demostrada del espín transmitido preferentemente.
  • Se observaron polarizaciones de alta corriente de hasta el 70% para ambas direcciones de giro.

Conclusiones:

  • El dispositivo desarrollado funciona como un filtro de espín de electrones coherente cuántico eficaz.
  • Este trabajo presenta un método totalmente eléctrico para crear y detectar corrientes polarizadas de espín.
  • Las altas polarizaciones observadas son prometedoras para las aplicaciones de la espintrónica.