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関連する概念動画

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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関連する実験動画

Updated: May 7, 2026

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

隙間を持つ超伝導体のインターフェースは,高温超伝導体のような振る舞いをする.

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
まとめ
この要約は機械生成です。

二次元 (2D) 超伝導体を研究すると,その状態の電子スペクトル密度が,キャリアの枯渇とともにどのように変化するかが明らかになる. 超伝導エネルギーのギャップは,キャリアの枯渇とともに増加し,高温超伝導体におけるpseudogapの振る舞いを反映しています.

さらに関連する動画

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
04:51

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

Published on: July 8, 2021

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
10:36

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating

Published on: April 12, 2018

関連する実験動画

Last Updated: May 7, 2026

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

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
04:51

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

Published on: July 8, 2021

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
10:36

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating

Published on: April 12, 2018

科学分野:

  • 凝縮物質物理学 凝縮物質物理学
  • マテリアルサイエンス 材料科学
  • 量子力学は,量子力学という

背景:

  • 二次元 (2D) 電子系における超伝導性を理解することは,高過渡温度銅酸化物超伝導体および将来のインタフェースベースの超伝導体にとって極めて重要です.
  • これらのシステムにおけるキャリア枯渇時の状態のスペクトル密度のような基本的な超伝導パラメータの振る舞いは,まだ十分に理解されていません.

研究 の 目的:

  • キャリア密度の関数として2D超伝導体内の状態の電子スペクトル密度の変化を実験的に調査する.
  • 2D電子系において,電荷载体が枯渇したときに超伝導パラメータがどのように進化するかを明らかにする.

主な方法:

  • 平面交差点を持つトンネルスペクトロスコピーを利用して,状態の電子スペクトル密度を測定しました.
  • 導電性LaAlO3-SrTiO3インターフェイスを,電ゲートフィールドによって制御される,調節可能な2D超伝導体として採用した.

主要な成果:

  • Bardeen-Cooper-Schrieffer超伝導ギャップ関数と一致する状態の密度において,約40マイクロ電子ボルトのエネルギーギャップを観測した.
  • 超伝導のギャップは,ドーピング不足地域とドーピング過剰地域の両方で,充電キャリアの枯渇とともに増加することが判明しました.
  • この行動は,キャリア密度に対する臨界温度のドーム状の依存と対照的です.

結論:

  • キャリア枯渇による超伝導ギャップの観測された増加は,高移行温度銅酸化物超伝導体における擬似ギャップの行動に類似しています.
  • これらの発見は,超伝導的ギャップから偽ギャップのような行動へのスムーズな移行が,2D超伝導性の一般的な特徴である可能性があることを示唆しています.