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Related Concept Videos

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...
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...
Theory of Metallic Conduction01:17

Theory of Metallic Conduction

The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
Electric Field at the Surface of a Conductor01:26

Electric Field at the Surface of a Conductor

Consider a conductor in electrostatic equilibrium. The net electric field inside a conductor vanishes, and extra charges on the conductor reside on its outer surface, regardless of where they originate.
In the 19th century, Michael Faraday conducted the famous ice pail experiment to prove that the charges always reside on the surface of a conductor. The experimental set-up consists of a conducting uncharged container mounted on an insulating stand. The outer surface of the container is...
Second Uniqueness Theorem01:16

Second Uniqueness Theorem

Consider a region consisting of several individual conductors with a definite charge density in the region between these conductors. The second uniqueness theorem states that if the total charge on each conductor and the charge density in the in-between region are known, then the electric field can be uniquely determined.
In contrast, consider that the electric field is non-unique and apply Gauss's law in divergence form in the region between the conductors and the integral form to the surface...
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...

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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Superconductivity at the two-dimensional limit.

Shengyong Qin1, Jungdae Kim, Qian Niu

  • 1Department of Physics, University of Texas at Austin, Austin, TX 78712, USA.

Science (New York, N.Y.)
|May 2, 2009
PubMed
Summary
This summary is machine-generated.

Superconductivity persists in ultrathin lead films, even at two atomic layers. The transition temperature drops sharply, showing sensitivity to atomic structure and substrate effects on Cooper pair binding.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Investigating superconductivity in reduced dimensions is crucial for understanding fundamental quantum phenomena.
  • Ultrathin films offer a unique platform to explore the limits of superconductivity.
  • The role of dimensionality and substrate interactions in superconductivity remains an active research area.

Purpose of the Study:

  • To study superconductivity in the extreme two-dimensional (2D) limit using ultrathin lead (Pb) films.
  • To determine the behavior of superconducting order and transition temperature as film thickness approaches the 2D limit.
  • To understand the influence of atomic structure and substrate on superconductivity in few-layer films.

Main Methods:

  • Fabrication of ultrathin lead films with thicknesses down to two atomic layers.
  • Utilized scanning tunneling spectroscopy (STS) to probe local electronic properties.
  • Analyzed the superconducting order parameter and transition temperature as a function of film thickness and structure.

Main Results:

  • Local superconducting order remains robust down to two atomic layers.
  • A significant and abrupt drop in the superconducting transition temperature is observed at two atomic layers.
  • The transition temperature exhibits strong dependence on the specific atomic structure of the ultrathin film.

Conclusions:

  • Cooper pairs can still form in the single quantum well state channel present in two-dimensional films.
  • The binding energy of Cooper pairs is significantly influenced by the substrate.
  • These findings provide critical insights into the fundamental limits of superconductivity in reduced dimensions.