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関連する概念動画

Fermi Level Dynamics01:12

Fermi Level Dynamics

624
The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
624
Fermi Level01:18

Fermi Level

1.5K
The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...
1.5K
Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation04:01

Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation

38.7K
Thus far, the ideal gas law, PV = nRT, has been applied to a variety of different types of problems, ranging from reaction stoichiometry and empirical and molecular formula problems to determining the density and molar mass of a gas. However, the behavior of a gas is often non-ideal, meaning that the observed relationships between its pressure, volume, and temperature are not accurately described by the gas laws.
38.7K
Molecular Orbital Theory II03:51

Molecular Orbital Theory II

26.7K
Molecular Orbital Energy Diagrams
26.7K
Kinetic Theory of an Ideal Gas01:12

Kinetic Theory of an Ideal Gas

4.6K
A mole is defined as the amount of any substance that contains as many molecules as there are atoms in exactly 12 grams of carbon-12. An Italian scientist Amedeo Avogadro (1776–1856) formed the  hypothesis that equal volumes of gas at equal pressure and temperature contain equal numbers of molecules, independent of the type of gas. Later, the hypothesis was developed to form the SI unit for measuring the amount of any substance.
The number of molecules in one mole is called...
4.6K
Maxwell-Boltzmann Distribution: Problem Solving01:20

Maxwell-Boltzmann Distribution: Problem Solving

2.8K
Individual molecules in a gas move in random directions, but a gas containing numerous molecules has a predictable distribution of molecular speeds, which is known as the Maxwell-Boltzmann distribution, f(v).
This distribution function f(v) is defined by saying that the expected number N (v1,v2) of particles with speeds between v1 and v2 is given by
2.8K

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関連する実験動画

Updated: Jan 8, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

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強く相互作用するフェルミガスのシャピロ段階

Giulia Del Pace1,2,3, Diego Hernández-Rajkov2,3, Vijay Pal Singh4

  • 1Department of Physics, University of Florence, Sesto Fiorentino, Italy.

Science (New York, N.Y.)
|December 11, 2025
PubMed
まとめ

研究者たちは 超冷たい原子のジョセフソン結合に シャピロのステップを観察しました この発見は,量子多体系における同期メカニズムを明らかにし,非均衡のダイナミクスを研究するための新しい道を開きます.

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

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関連する実験動画

Last Updated: Jan 8, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

7.8K
Spatial Separation of Molecular Conformers and Clusters
10:37

Spatial Separation of Molecular Conformers and Clusters

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

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科学分野:

  • 量子物理学
  • 超冷たい原子
  • 凝縮物質物理学

背景:

  • 多体システムでは 複雑なダイナミクスを表します
  • ジョセフソン・ジャンクションは 量子エレクトロニクスにとって不可欠です
  • 超冷たい原子は 量子現象をシミュレートするための プラットフォームを提供します

研究 の 目的:

  • フェルミ超流体のジョセフソン交点におけるシャピロのステップを観察する.
  • 基礎となる同期メカニズムを調査する
  • 駆動量子システムにおける新興の非均衡のダイナミクスを探求する.

主な方法:

  • 超冷フェルミ超流体とのジョセフソン結合の実験的実現.
  • 定期的なシステム操作
  • 電流・電位特性の測定
  • 電流と相の関係を直接測定する.
  • フェーズスリップの検出
  • サーキットモデリングと数値シミュレーション

主要な成果:

  • 定量化高原 (シャピロステップ) を電流潜在特性で観測する.
  • プレートの高さと幅は,駆動周波数とジャンクション非線形性と相関する.
  • 相対的な相と外部ドライブ間の同期を示す.
  • 渦巻きと反渦巻きのペアの検出は,相滑りを示しています.

結論:

  • シャピロのステップは,駆動されたジョセフソン交差点の同期メカニズムから生じる.
  • この研究は新興の不均衡のダイナミクスの洞察を提供します.
  • この研究は,量子力学による多体システムのシミュレーションと理解の見通しを開きます.