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Superconductor

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...

Types Of Superconductors

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...

Schottky Barrier Diode

Schottky Barrier Diode

Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...

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In electronic circuits, reverse-biased diode configurations are critical for regulating voltage levels. Zener diodes exploit the reverse breakdown phenomenon and exhibit a controlled breakdown at a specific Zener voltage (VZ). They are designed to maintain a constant voltage across their terminals and are commonly used for voltage regulation in circuits.
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In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A...

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A diode is reverse-biased when the positive terminal of an external voltage source is connected to the n-type material and the negative terminal to the p-type material. This configuration opposes the natural direction of current flow through the diode, effectively increasing the width of the depletion region and the barrier potential. The reverse bias condition produces a minimal leakage current, primarily due to minority charge carriers. This leakage becomes significant when the reverse...

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Observación del efecto del diodo superconductor

Fuyuki Ando¹, Yuta Miyasaka¹, Tian Li¹

¹Institute for Chemical Research, Kyoto University, Kyoto, Japan.

|August 21, 2020

Resumen

Los investigadores desarrollaron un diodo superconductor controlado magnéticamente utilizando una superrejilla [Nb/V/Ta]_n. Este dispositivo exhibe resistencia cero en una dirección, lo que permite el transporte de carga no disipadora para futuros circuitos electrónicos.

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Área de la Ciencia:

Física de la materia condensada
La electrónica cuántica
Ciencias de los materiales

Sus antecedentes:

Los efectos ópticos y eléctricos no lineales surgen de la ruptura de la simetría de inversión espacial, lo que permite el transporte de partículas de dirección selectiva.
Los diodos semiconductores exhiben resistencia no recíproca, pero sufren pérdidas de energía debido a la resistencia finita.

Objetivo del estudio:

Realizar un diodo superconductor con resistencia unidireccional cero, superando las limitaciones de pérdida de energía de los diodos convencionales.
Para demostrar un diodo superconductor controlado magnéticamente en una estructura de superred artificial.

Principales métodos:

Fabricación de una superred artificial [Nb/V/Ta] sin centro de inversión.
Mediciones de corriente continua para observar el comportamiento de la resistencia frente a la corriente en la transición de superconductor a normal.

Principales resultados:

Observación de una curva de resistencia no recíproca, que indica el comportamiento del diodo en el estado superconductor.
Demostración de la resistencia cero unidireccional en la superrejilla [Nb/V/Ta]_n debido a la corriente crítica no recíproca.
Atribución del efecto a la anisotropía magnetoquiral a partir de simetrías rotas de inversión espacial y de reversión temporal.

Conclusiones:

El diodo superconductor desarrollado permite el transporte de carga de fase coherente y direccional.
Este avance allana el camino para la construcción de circuitos electrónicos no disipadores.
El estudio pone de relieve el potencial de las superredes diseñadas para nuevas funcionalidades electrónicas.