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Related Concept Videos

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.
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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.
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Related Experiment Video

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

A gate-controlled bidirectional spin filter using quantum coherence.

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
Summary
This summary is machine-generated.

We developed a quantum coherent electron spin filter using a quantum dot and magnetic field. This device electrically controls and detects spin-polarized currents with high polarization up to 70%.

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Last Updated: Jul 6, 2026

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Published on: November 11, 2013

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Spintronics

Background:

  • Electron spin polarization is crucial for quantum technologies.
  • Current methods for spin manipulation often lack full electrical control.

Purpose of the Study:

  • To demonstrate a novel quantum coherent electron spin filter.
  • To achieve fully electrical control and detection of spin-polarized currents.

Main Methods:

  • Utilized an open quantum dot subjected to an in-plane magnetic field.
  • Exploited spin-dependent quantum interference and gate voltage tuning.
  • Directly measured the spin polarization of the emitted current.

Main Results:

  • Achieved spin-dependent quantum interference through controlled Fermi wavelengths.
  • Demonstrated electrical selection of preferentially transmitted spin.
  • Observed high current polarizations up to 70% for both spin directions.

Conclusions:

  • The developed device functions as an effective quantum coherent electron spin filter.
  • This work presents a fully electrical method for creating and detecting spin-polarized currents.
  • The high observed polarizations show promise for spintronic applications.