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Related Concept Videos

Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved in...
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Spin-asymmetric Josephson effect.

M O J Heikkinen1, F Massel, J Kajala

  • 1Department of Applied Physics, Aalto University School of Science and Technology, P.O.Box 15100, FI-00076 Aalto, Finland.

Physical Review Letters
|January 15, 2011
PubMed
Summary
This summary is machine-generated.

Ultracold Fermi gases can exhibit a spin-asymmetric Josephson effect, where spin components oscillate with different amplitudes. This challenges the standard interpretation of supercurrents, proposing an alternative based on Rabi oscillations.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Gases
  • Superconductivity

Background:

  • Josephson effect describes supercurrents between superconductors.
  • Cooper pairs consist of two electrons with opposite spins.
  • Standard models assume symmetric behavior for spin components.

Purpose of the Study:

  • Propose and investigate a spin-asymmetric Josephson effect in ultracold Fermi gases.
  • Explore the behavior of spin-up and spin-down components in Cooper pairs.
  • Develop a new interpretation of the Josephson supercurrent.

Main Methods:

  • Theoretical modeling of ultracold Fermi gases.
  • Analysis of spin-dependent Cooper pair dynamics.
  • Investigation of Josephson junction behavior with asymmetric voltages.

Main Results:

  • Predicted spin-up and spin-down components oscillate at the same frequency but different amplitudes.
  • Demonstrated that standard bosonic pair tunneling interpretation is insufficient.
  • Proposed an intuitive interpretation of supercurrent as interference in Rabi oscillations.

Conclusions:

  • Ultracold Fermi gases provide a platform for realizing spin-asymmetric Josephson effects.
  • The spin-asymmetric Josephson effect offers new insights into supercurrent mechanisms.
  • Rabi oscillation interference provides a more comprehensive understanding of Josephson supercurrents.