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関連する概念動画

Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
Half wave rectifier01:20

Half wave rectifier

A half-wave rectifier is a fundamental circuit in electronics, designed to convert alternating current (AC) voltage into a unidirectional voltage. It utilizes the simplest form of diode rectification, where the circuit comprises a single diode in series with a load resistor and an AC power source.
Clipper Circuit01:18

Clipper Circuit

A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.
The operation of a clipper circuit can be exemplified by analyzing a dual-clipper configuration setup that integrates two ideal diodes, each paired with a biasing...
Clamper Circuit01:14

Clamper Circuit

A clamper circuit, also known as a DC restorer, represents a specialized variant of the rectifier circuit, notable for its method of taking the output across the diode rather than the capacitor. This configuration lends to several distinctive applications, particularly in handling square wave inputs.
Within this circuit, the diode's orientation prompts the capacitor to charge up to the level of the most negative peak of the input signal. Upon reaching this state, the diode ceases to conduct,...
Voltage Doubler Circuit01:23

Voltage Doubler Circuit

A voltage doubler circuit integrates two main components: a clamping section and a rectifier section. The clamping section consists of a capacitor (C1) and a diode (D1), whereas the rectifier section is equipped with another diode (D2) and capacitor (C2). This circuit produces an output voltage with twice the amplitude of the sinusoidal input voltage.

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関連する実験動画

Updated: Jul 6, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

ゲート制御の双方向スピンフィルターで,量子コヘレンスを使用しています.

J A Folk1, R M Potok, C M Marcus

  • 1Department of Physics, Harvard University, Cambridge, MA 02138, USA. jfolk@stanford.edu

Science (New York, N.Y.)
|February 1, 2003
PubMed
まとめ
この要約は機械生成です。

量子ドットと磁場を用いた量子コヘラン電子スピンフィルターを開発しました. この装置は,70%までの高偏振のスピン偏振電流を電気的に制御し,検出します.

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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

関連する実験動画

Last Updated: Jul 6, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

科学分野:

  • 量子物理学とは,量子物理学のことです.
  • 凝縮物質物理学 凝縮物質物理学
  • スピントロニクス (Spintronics) は,スピントロニクス (Spintronics) を開発したものです.

背景:

  • 電子スピン偏振は,量子技術にとって極めて重要です.
  • 現在のスピン操作の方法は,しばしば完全な電気制御が欠けている.

研究 の 目的:

  • 新しい量子コヒーレント電子スピンフィルターを実証する.
  • 完全に電気的な制御とスピン極化電流の検出を実現するために.

主な方法:

  • オープンな量子ドットを用いて,平面内磁場を適用した.
  • スピン依存量子干渉とゲート電圧チューニングを活用した.
  • 放出された電流のスピン偏振を直接測定した.

主要な成果:

  • 制御されたフェルミ波長を通して,スピン依存の量子干渉を達成した.
  • 偏好的に伝達されるスピンの電気的選択が実証されている.
  • 両方のスピン方向で最大70%の高電流偏振が観測されました.

結論:

  • 開発されたデバイスは,効率的な量子コヘラン電子スピンフィルターとして機能します.
  • 本稿では,スピン極化電流の生成と検出のための完全に電気的な方法について説明します.
  • 観測された高分極化は,スピントロニックの応用に希望を示しています.