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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
The de Broglie Wavelength02:32

The de Broglie Wavelength

In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Published on: June 8, 2018

Carrier-envelope-phase dependent coherence in double quantum wells.

Wen-Xing Yang1, Xiaoxue Yang, Ray-Kuang Lee

  • 1Department of Physics, Southeast University, Nanjing 210096, China.

Optics Express
|September 3, 2009
PubMed
Summary

Transient coherence in asymmetric semiconductor double quantum wells is strongly dependent on carrier-envelope-phase (CEP). Fano-type interference enhances this coherence, enabling a new method for CEP determination using quantum beat signals.

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Last Updated: Jun 20, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Published on: June 8, 2018

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Area of Science:

  • Quantum optics
  • Semiconductor physics
  • Ultrafast phenomena

Background:

  • Quantum wells are crucial in semiconductor devices.
  • Ultrafast laser pulses probe carrier dynamics.
  • Carrier-envelope-phase (CEP) influences quantum phenomena.

Purpose of the Study:

  • Investigate CEP effects on transient coherence in asymmetric semiconductor double quantum wells.
  • Explore Fano-type interference for coherence enhancement.
  • Develop a method for CEP determination.

Main Methods:

  • Numerical analysis of laser-matter interaction.
  • Simulation of few-cycle laser pulse propagation.
  • Modeling of carrier dynamics in quantum wells.

Main Results:

  • Transient coherence is highly sensitive to CEP.
  • Fano-type interference significantly enhances coherence.
  • Quantum beat signals directly correlate with CEP.

Conclusions:

  • CEP is a critical parameter for controlling quantum coherence.
  • Fano interference offers a pathway to amplify quantum effects.
  • The proposed method provides direct CEP measurement via quantum beats.