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Electrostatic Boundary Conditions01:16

Electrostatic Boundary Conditions

940
Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
The surface integral of an electric field is given by Gauss's law in integral form and is related to...
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Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

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When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity....
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Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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Underflow Gates01:30

Underflow Gates

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Underflow gates are vital for controlling water flow in irrigation canals. The three main types of underflow gates — vertical, radial, and drum gates — serve different purposes while ensuring effective flow management. Vertical gates move up and down, generating a free-flowing water jet; radial gates pivot to regulate the flow; and drum gates rotate for precise adjustments. The flow through these gates is influenced by downstream conditions, resulting in free or drowned outflow.Free and...
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Non-gated Ion Channels01:24

Non-gated Ion Channels

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Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
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Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
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2次元ヘテロ構造における静電ゲート効果の可視化

Paul V Nguyen1, Natalie C Teutsch2, Nathan P Wilson1

  • 1Department of Physics, University of Washington, Seattle, WA, USA.

Nature
|July 19, 2019
PubMed
まとめ
この要約は機械生成です。

マイクロメータースケールの角度解像度光放出スペクトロスコーピー (microARPES) は,フィールド効果装置における電子状態の直接監視を可能にします. このテクニックは,電気制御下での2D材料のフェルミレベルシフトとバンドギャップリノーマライゼーションを明らかにします.

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Electrostatic Method to Remove Particulate Organic Matter from Soil
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科学分野:

  • 凝縮物質物理学
  • 材料科学
  • ナノテクノロジー

背景:

  • フィールドエフェクト装置における電子の振る舞いを理解することは,デバイス物理学にとって極めて重要です.
  • 電気ポテンシャル,フェルミレベル,帯域構造の 局所的な変化を直接画像化することは 変革的です
  • 二次元のヴァン・デル・ワールスのヘテロ構造は ユニークな電子特性を有する.

研究 の 目的:

  • 2Dヘテロ構造における電子状態をモニタリングするマイクロARPESの能力を実証する.
  • グラフェンと2D半導体の電子特性に対する静電ドーピングの影響を調査する.
  • ゲート制御の電子特性と光学スペクトル測定を相関させる.

主な方法:

  • マイクロメートルスケール角度解像度光放出スペクトロシー (microARPES) の適用
  • グラフェンと単層のボルンガム・デセレニドを含む二次元ヴァン・ダー・ワールズ・ヘテロ構造を用いる.
  • ゲート電圧で2つの端末装置で測定を行う.

主要な成果:

  • 観察されたフェルミレベルは,分散変化なしにグラフェンのディラク点に移動する.
  • 電子を蓄積した2D半導体における伝導帯域のエッジを特定した.
  • 静電ドーピングによる単層トングステン・ディセレニドの帯域間隔再正常化.

結論:

  • マイクロARPESは,ゲートされた2Dデバイスの電子状態に関する前例のない洞察を提供します.
  • この技術はゲート制御の電子的および光学的性質の決定的な研究を可能にします.
  • この方法は,基本的な物理,トポロジカルトランジション,および多体効果の探索に強力です.