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Related Concept Videos

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...
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis. This...
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other axis.
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...
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse.

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Related Experiment Video

Updated: May 19, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Structural analysis of strained quantum dots using nuclear magnetic resonance.

E A Chekhovich1, K V Kavokin, J Puebla

  • 1Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK. e.chekhovich@sheffield.ac.uk

Nature Nanotechnology
|August 28, 2012
PubMed
Summary

Optically detected NMR spectroscopy now analyzes individual strained semiconductor nanostructures. This breakthrough enables nanoscale structural analysis for quantum devices, overcoming limitations of destructive microscopy and broadening NMR applications.

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Related Experiment Videos

Last Updated: May 19, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

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14:55

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

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Area of Science:

  • Solid-state physics and quantum information science.
  • Nanotechnology and materials science.

Background:

  • Strained semiconductor nanostructures are crucial for quantum technologies like single-photon sources and quantum logic devices.
  • Existing nanoscale structural analysis methods are often destructive, limiting their use in sensitive quantum applications.
  • Nuclear Magnetic Resonance (NMR) offers non-invasive analysis but is typically limited to strain-free nanostructures due to quadrupole broadening.

Purpose of the Study:

  • To develop a non-invasive technique for nanoscale structural analysis of individual strained semiconductor nanostructures.
  • To overcome the limitations of traditional NMR spectroscopy in analyzing strained quantum dots.
  • To enable precise characterization of strain distribution and chemical composition in nanostructures for quantum information processing.

Main Methods:

  • Implementation of optically detected NMR (ODNMR) spectroscopy.
  • Utilizing continuous-wave broadband radiofrequency excitation with a specialized spectral pattern.
  • Probing individual strained nanostructures with as few as 1 × 10^5 quadrupole nuclear spins.

Main Results:

  • Successful analysis of individual strained quantum dots using ODNMR spectroscopy.
  • Measurement of strain distribution and chemical composition within the volume of a confined electron in quantum dots.
  • Demonstration of a method to overcome significant strain-induced quadrupole broadening in NMR spectra.

Conclusions:

  • Optically detected NMR spectroscopy is a viable non-invasive technique for analyzing individual strained nanostructures.
  • This method advances the structural characterization of materials critical for quantum information processing.
  • The technique holds potential for precise control of nuclear spins in complex quantum systems.