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Related Concept Videos

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...
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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...
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...
Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not contribute to...
Nuclear Overhauser Enhancement (NOE)01:06

Nuclear Overhauser Enhancement (NOE)

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...

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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

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Nuclear spin cooling using Overhauser-field selective coherent population trapping.

M Issler1, E M Kessler, G Giedke

  • 1Institute of Quantum Electronics, ETH-Zürich, Zürich, Switzerland.

Physical Review Letters
|January 15, 2011
PubMed
Summary

Quantum interference in solid-state emitters prepares nuclear spins, suppressing electronic spin dephasing. This controlled evolution leads to a coherent population trapping state, verified by a broadened dark resonance.

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Area of Science:

  • Quantum Optics
  • Solid-State Physics
  • Quantum Information Science

Background:

  • Electronic spin dephasing in solid-state emitters limits quantum control.
  • Nuclear spins can provide a stable environment for electronic spins.
  • Controlling nuclear spin states is crucial for robust quantum applications.

Purpose of the Study:

  • To demonstrate a method for preparing nuclear spins in well-defined states using quantum interference.
  • To suppress electronic spin dephasing by controlling the surrounding nuclear spin environment.
  • To investigate the dynamics of coupled electron-nuclear spin systems.

Main Methods:

  • Utilizing quantum interference in optical absorption from two electronic spin states.
  • Employing optical-excitation-induced nuclear-spin diffusion to evolve the system.
  • Observing spectroscopic signatures, specifically the broadening of dark resonance, in optical absorption experiments.

Main Results:

  • A quantum interference effect was used to prepare nuclear spins in well-defined states.
  • Electronic spin dephasing was suppressed due to the prepared nuclear spin environment.
  • The coupled electron-nuclear system evolved into a coherent population trapping state.
  • A drastic broadening of the dark resonance was observed, confirming the electron's environmental modification.

Conclusions:

  • Quantum interference offers a viable pathway to control nuclear spin environments in solid-state systems.
  • Suppression of electronic spin dephasing is achievable through engineered nuclear spin states.
  • The observed spectroscopic signature provides a clear verification of nuclear spin preparation and system evolution.