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Videos de Conceptos Relacionados

Types Of Superconductors01:28

Types Of Superconductors

A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
Superconductor01:24

Superconductor

A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
Semiconductors01:22

Semiconductors

There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
Band Theory02:35

Band Theory

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,...
Types of Semiconductors01:20

Types of Semiconductors

Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...

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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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El superconductor de interfaz con comportamiento de hueco se comporta como un superconductor de alta temperatura.

C Richter1, H Boschker, W Dietsche

  • 11] Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany [2] Experimental Physics VI, Center for Electronic Correlations and Magnetism, Augsburg University, 86135 Augsburg, Germany.

Nature
|October 8, 2013
PubMed
Resumen
Este resumen es generado por máquina.

Investigar superconductores bidimensionales (2D) revela cómo su densidad espectral electrónica de estados cambia con el agotamiento de la portadora. La brecha de energía superconductora aumenta con el agotamiento del portador, reflejando el comportamiento pseudogap en los superconductores de alta temperatura.

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Área de la Ciencia:

  • Física de la materia condensada Física de la materia condensada
  • Ciencia de los materiales Ciencia de los materiales.
  • La mecánica cuántica es la mecánica cuántica.

Sus antecedentes:

  • Comprender la superconductividad en sistemas de electrones bidimensionales (2D) es crucial para los superconductores de óxido de cobre de alta temperatura de transición y los futuros superconductores basados en interfaces.
  • El comportamiento de los parámetros superconductores fundamentales, como la densidad espectral de los estados, durante el agotamiento de la portadora en estos sistemas sigue siendo poco comprendido.

Objetivo del estudio:

  • Investigar experimentalmente los cambios en la densidad espectral electrónica de los estados en un superconductor 2D en función de la densidad de la portadora.
  • Para aclarar cómo evolucionan los parámetros superconductores cuando los portadores de carga se agotan en los sistemas de electrones 2D.

Principales métodos:

  • Utilizó espectroscopia de túnel con uniones planas para medir la densidad espectral electrónica de los estados.
  • Empleó la interfaz de conducción LaAlO3-SrTiO3 como un superconductor 2D sintonizable, controlado por un campo de puerta eléctrica.

Principales resultados:

  • Se observó una brecha de energía de aproximadamente 40 microelectronvoltios en la densidad de estados, consistente con la función de brecha superconductora de Bardeen-Cooper-Schrieffer.
  • Se descubrió que la brecha superconductora aumentaba con el agotamiento de los portadores de carga tanto en las regiones sub-dopadas como en las sobredopadas.
  • Este comportamiento contrasta con la dependencia en forma de cúpula de la temperatura crítica en la densidad del portador.

Conclusiones:

  • El aumento observado en la brecha superconductora con agotamiento del portador es análogo al comportamiento de la pseudobrecha en los superconductores de óxido de cobre de alta temperatura de transición.
  • Estos hallazgos sugieren que una transición suave de la brecha superconductora al comportamiento pseudogap puede ser una característica general de la superconductividad 2D.