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関連する概念動画

Carrier Transport01:21

Carrier Transport

1.1K
The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
1.1K
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

733
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
733
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

1.2K
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
1.2K
Joule-Thomson Effect01:21

Joule-Thomson Effect

10.6K
The Joule-Thomson effect, also known as the Joule-Kelvin effect, describes the temperature change of a fluid when it is forced through a valve or porous plug while keeping it in a thermally insulated environment. This experiment is called a throttling process. This is an important effect widely used in refrigeration and the liquefaction of gases.
This experiment forces high-pressure gas through a throttle valve or a porous plug to a lower-pressure region. The gas expands as it passes through to...
10.6K
Theory of Metallic Conduction01:17

Theory of Metallic Conduction

1.9K
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,...
1.9K
P-N junction01:11

P-N junction

1.5K
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
1.5K

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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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単原子結合における量子化熱輸送

Longji Cui1, Wonho Jeong1, Sunghoon Hur1

  • 1Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA.

Science (New York, N.Y.)
|February 18, 2017
PubMed
まとめ
この要約は機械生成です。

研究者は金とプラチナのワイヤの 単原子結合の熱伝導性を測定しました 熱伝導は室温で量子化され 量子熱伝導の原理が確認されました

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Characterization of Thermal Transport in One-dimensional Solid Materials
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Characterization of Thermal Transport in One-dimensional Solid Materials

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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings

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関連する実験動画

Last Updated: Mar 7, 2026

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Published on: August 2, 2019

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Characterization of Thermal Transport in One-dimensional Solid Materials
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Characterization of Thermal Transport in One-dimensional Solid Materials

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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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科学分野:

  • 凝縮物質物理学
  • 量子力学について
  • ナノテクノロジー

背景:

  • 原子スケールでの熱伝達を理解することは 量子現象の探求に不可欠です
  • 以前の研究では,個々の原子のコンタクトで熱伝導性を探査する解像度が欠けていました.

研究 の 目的:

  • 金属のワイヤーの単原子結合の熱伝導性を実験的に測定する.
  • 原子スケールでの熱輸送における量子効果を調査する.
  • ウィーデマン=フランツの法則を 原子接触で検証する

主な方法:

  • ピコワット解像度の新型カロメトリックスキャニングプローブを使用して,正確な測定を行いました.
  • シングル原子の解像度を達成するためにカスタム装備を製造.
  • 金とプラチナの原子結合で測定された熱伝導率.

主要な成果:

  • 部屋の温度で金単一原子の結合で量子化された熱伝導性を証明した.
  • ワイドマン=フランツの法則が 単原子接触レベルでも有効であることを確認しました
  • 量子熱伝送のためのランダウアーフレームワークを用いて定量的に説明された実験結果.

結論:

  • 実験技術は原子や分子システムにおける量子熱伝達の詳細な研究を可能にします
  • 発見は,ナノスケールの熱伝送における,これまでアクセスできなかった根本的な問題を調査するための基盤を提供します.
  • この研究は,原子レベルで物質の量子効果を探求するための新しい道を開きます.