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相关概念视频

Atomic Force Microscopy01:08

Atomic Force Microscopy

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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
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The probe is regarded as the heart of any AFM setup and comprises the...
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Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

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Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
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Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Updated: Sep 17, 2025

Author Spotlight: Introduction to Active Probe Atomic Force Microscopy with Quattro-Parallel Cantilever Arrays
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反驱动的原子尺度约瑟夫森显微镜.

Samuel D Escribano1,2, Víctor Barrena3, David Perconte3,4

  • 1Departamento de Física Teórica de la Materia Condensada, Instituto Nicolás Cabrera and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, E-28049, Madrid, Spain. samuel.diazes@gmail.com.

Nature communications
|July 2, 2025
PubMed
概括
此摘要是机器生成的。

研究人员使用反在原子结点创建了一个温度独立的约瑟夫森合. 这使得2H-NbSe2等超导体中关键电流的原子尺度映射成为可能,揭示了对密度波.

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相关实验视频

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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科学领域:

  • 凝聚物质物理学 凝聚物质物理学
  • 量子现象是一种量子现象.

背景情况:

  • 原子尺度的约瑟夫森连接对于理解超导性至关重要.
  • 现有的超小连接处因合较弱和温度敏感性而受到损害.
  • 需要新的方法来探测原子层上的超导特性.

研究的目的:

  • 为了研究反元件对原子尺度约瑟夫森连接的作用.
  • 开发一种温度独立的方法来研究库珀对道.
  • 在超导材料中创建关键电流的原子分辨率地图.

主要方法:

  • 引入一个反元件来诱导一个依赖时间的双稳定状态.
  • 在DC和ACJosephson模式之间观察自发周期性振荡.
  • 使用扫描道显微镜在空间上绘制关键电流振荡图.

主要成果:

  • 在原子约瑟夫森连接处实现了温度独立的双稳定状态.
  • 在库珀对道状态之间观察到自发振荡.
  • 原子尺度地图显示了由于2H-NbSe2.2.中的对密度波导致的临界电流中的空间调制.

结论:

  • 反元件可以稳定原子约瑟夫森结对温度变化.
  • 这种技术为超导材料的原子尺度表征提供了一条新的途径.
  • 这些发现提高了对超小电子设备中的量子效应的理解.