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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...
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Stable Skyrmions in spinor condensates.

Igor F Herbut1, Masaki Oshikawa

  • 1Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6.

Physical Review Letters
|October 10, 2006
PubMed
Summary

Stable topological defects are not supported in globally symmetric spinor condensates. However, a topological Skyrmion can be stabilized in three dimensions by controlling condensate density profiles, relevant to Bose-Einstein condensation in 87Rb.

Area of Science:

  • Condensed matter physics
  • Quantum physics
  • Atomic physics

Background:

  • Globally symmetric spinor condensates in free space typically do not support stable topological defects in 2D or 3D.
  • Understanding topological defects is crucial for quantum technologies.

Purpose of the Study:

  • To investigate the possibility of stabilizing topological defects in globally symmetric spinor condensates.
  • To determine conditions for the existence of stable topological Skyrmions in three dimensions.

Main Methods:

  • Theoretical analysis of spinor condensate properties.
  • Formulation of a sufficient condition for Skyrmion existence.
  • Illustration with simple density profile examples.

Main Results:

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Published on: June 28, 2018

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

  • Globally symmetric spinor condensates in free space do not support stable topological defects.
  • A topological Skyrmion can be stabilized in three dimensions by imposing specific density profiles.
  • A sufficient condition for Skyrmion solutions was derived and demonstrated.

Conclusions:

  • Topological Skyrmions can be stabilized in three-dimensional spinor condensates under specific conditions.
  • The findings are relevant to Bose-Einstein condensation experiments, particularly with 87Rb.
  • This work opens avenues for exploring novel topological states in quantum condensates.