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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
Oscillations about an Equilibrium Position01:04

Oscillations about an Equilibrium Position

Stability is an important concept in oscillation. If an equilibrium point is stable, a slight disturbance of an object that is initially at the stable equilibrium point will cause the object to oscillate around that point. For an unstable equilibrium point, if the object is disturbed slightly, it will not return to the equilibrium point. There are three conditions for equilibrium points—stable, unstable, and half-stable. A half-stable equilibrium point is also unstable, but is named so because...
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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...
Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by

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関連する実験動画

Updated: Jun 11, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

超伝導ヘテロ構造における二次元の正規状態量子振動.

Y Kozuka1, M Kim, C Bell

  • 1Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan.

Nature
|November 27, 2009
PubMed
まとめ
この要約は機械生成です。

研究者らは,デルタドーピングされたストロンチウムチタナート (SrTiO3) を使用して,新しい二次元超伝導体を作成しました. この画期的な発見により,高流動性半導体ヘテロ構造における量子輸送の研究が可能になり,以前の限界を克服しました.

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

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A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics
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A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics

Published on: August 28, 2018

関連する実験動画

Last Updated: Jun 11, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

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

A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics
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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
  • 量子現象とは,量子現象である.

背景:

  • 半導体ヘテロ構造は,低次元電子系の研究に不可欠です.
  • 半導体における超伝導性は,高い電子乱れと短い電子平均自由経路によって制限されています.
  • 既存の超伝導薄膜は,しばしばインターフェースの散乱や原子スケールの乱れに苦しんでおり",汚い限界"に限定されています.

研究 の 目的:

  • 半導体ヘテロ構造の中で高品質の二次元超伝導層を製造する.
  • この新しい超伝導系における電子の量子輸送特性を調査するために.
  • 制御された半導体環境における超伝導と正規の電子の相互作用を探求する.

主な方法:

  • ストロンチウムチタナート (SrTiO3) を使用した薄膜ヘテロ構造の製造.
  • 狭い SrTiO3領域の選択的なデルタドーピングは,超伝導性を誘発するために,ナイオビウムを用いて行われます.
  • 磁場アニソトロピーの測定を介して超伝導体の二次元性を探査する.
  • 2D電子状態を確認するために,正規状態の抵抗におけるシュブニコフ・デ・ハース振動を観察する.

主要な成果:

  • デルタドーピングされたSrTiO3ヘテロ構造で高品質の二次元超伝導層を成功裏に作成しました.
  • シュブニコフ・デ・ハースの振動が垂直磁場とのスケーリングによって証明された高い電子の移動性を実証した.
  • 臨界磁場アニソトロピーによる超伝導状態の二次元性を確認した.

結論:

  • デルタドーピングされたSrTiO3は,高い電子移動性を有する超伝導体における量子輸送の探索のためのモデルシステムを提供しています.
  • この作業は,以前の半導体超伝導体の"汚い限界"の限界を克服しています.
  • 高品質の複雑な酸化物ヘテロ構造は,マクロスケールとマイクロスケールで電子一貫性を維持できます.