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関連する概念動画

Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

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The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
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Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Fermi Level Dynamics01:12

Fermi Level Dynamics

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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...
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Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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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,...
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Phase Transitions01:21

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A phase transition is the process in which a substance changes from one state of matter to another, like from a solid to a liquid, liquid to gas, or vice versa, at a specific temperature and under given pressure conditions. This change is spontaneous and is affected by alterations in temperature and pressure. These parameters impact the strength of the forces between molecules (intermolecular forces) in the substance.During a phase transition, both the initial and final phases of the substance...
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Phase Transitions02:31

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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BEC-BCSクロスオーバーにおけるフェルミオン超流体におけるジョセフソン効果

Giacomo Valtolina1, Alessia Burchianti2, Andrea Amico3

  • 1Istituto Nazionale di Ottica del Consiglio Nazionale delle Ricerche (CNR), 50019 Sesto Fiorentino, Italy. European Laboratory for Nonlinear Spectroscopy (LENS), 50019 Sesto Fiorentino, Italy. Faculty of Mathematic and Natural Sciences, Scuola Normale Superiore, 56126 Pisa, Italy.

Science (New York, N.Y.)
|December 19, 2015
PubMed
まとめ

研究者はフェルミオン超流体におけるジョセフソン効果を観察し,分子ボース-アインシュタイン凝縮物とバーディン-クーパー-シュリッファー超流体を結びつける量子現象を示した. これは 超流体力学と対称性の破綻に関する 重要な洞察を示しています

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科学分野:

  • 量子物理学
  • 凝縮物質物理学
  • 超流動性

背景:

  • ジョセフソン効果は 超流動的状態とその対称性の破損を理解するために 決定的なマクロスコープの量子現象です
  • フェルミオン超流体は,特に異なる超流体体制のクロスオーバーにおいて,複雑な行動を示す.

研究 の 目的:

  • 2つのフェルミオン超流体間のジョセフソン効果を観察し分析する.
  • BEC-BCSクロスオーバーにおけるフェルミオン超流体における相対集団と相の関係を調査する.
  • これらのシステムの消散力学と渦の伝播を研究する.

主な方法:

  • 2つのフェルミオン超流体を 薄いトンネルバリアで結合する
  • ダイナミックな反応を観察するために,均衡から初期刺激を誘導する.
  • 分子ボース-アインシュタイン凝縮体 (BEC) からバーディン-クーパー-シュリッファー (BCS) 超流体体制のクロスオーバーを通じてシステムの振る舞いを分析する.

主要な成果:

  • 2つのフェルミオン超流体間のジョセフソン効果を成功裏に観測した.
  • 相対的な集団と相は,定理的に結合変数であることを示した.
  • 観測された消散力学は,より大きな刺激のために渦の伝播に起因する.

結論:

  • この研究はフェルミオン超流体におけるジョセフソン効果を確認し,共振超流体の強さを強調した.
  • 超流体系における量子現象を より深く理解できるようになりました
  • 超流体の基本的な性質について 洞察を深めることができます