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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...
Nuclear Overhauser Enhancement (NOE)01:06

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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...
Atomic Nuclei: Magnetic Resonance01:05

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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 Spin State Overview01:03

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Large nuclear overhauser fields detected in vertically coupled double quantum dots.

Jonathan Baugh1, Yosuke Kitamura, Keiji Ono

  • 1Institute for Quantum Computing, University of Waterloo, 200 University Ave. W., Waterloo, ON, N2L 3G1, Canada.

Physical Review Letters
|October 13, 2007
PubMed
Summary

Researchers electrically induced and detected dynamic nuclear polarization in GaAs quantum dots. They achieved significant nuclear polarization (~40%) using spin-blockade effects and magnetic fields.

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

  • Quantum Information Science
  • Condensed Matter Physics
  • Semiconductor Nanostructures

Background:

  • Dynamic nuclear polarization (DNP) is crucial for enhancing NMR sensitivity.
  • Quantum dots offer tunable systems for studying spin phenomena.
  • Spin-blockade is a key mechanism in coupled quantum dot systems.

Purpose of the Study:

  • To demonstrate electrical induction and detection of DNP in a double quantum dot system.
  • To investigate the relationship between spin-blockade, nuclear Overhauser field, and current.
  • To quantify the achievable nuclear polarization levels.

Main Methods:

  • Utilizing double GaAs vertical quantum dots.
  • Employing bias voltage to control interdot spin exchange coupling.
  • Measuring DC current under variable external magnetic fields to probe nuclear Overhauser field.
  • Controlling spin-blockade regime.

Main Results:

  • Successfully achieved electrical induction and detection of DNP.
  • Observed a maximum nuclear Overhauser field of approximately 4 Tesla.
  • Correlated nuclear polarization of approximately 40% with the electronic g-factor (|g*| ≈ 0.25).

Conclusions:

  • Electrical control of DNP in quantum dots is feasible.
  • The observed Overhauser field is significant and controllable.
  • A phenomenological model can explain the experimental findings in GaAs quantum dots.