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Related Concept Videos

The Hall Effect01:30

The Hall Effect

2.1K
Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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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...
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NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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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...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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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.
594
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

852
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.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
852
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

894
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.
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Related Experiment Video

Updated: May 15, 2025

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

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Inverse Spin Thermal Hall Effect in Nonreciprocal Photonic Systems.

P Ben-Abdallah1

  • 1Université Paris-Saclay, Laboratoire Charles Fabry, UMR 8501, Institut d'Optique, CNRS, 2 Avenue Augustin Fresnel, 91127 Palaiseau Cedex, France.

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|April 7, 2025
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Summary
This summary is machine-generated.

Researchers predict a new thermal effect analogous to the inverse spin Hall effect. This phenomenon involves a transverse radiative heat flux generated by light

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Area of Science:

  • Photonics and Spintronics
  • Thermal Transport Phenomena

Background:

  • Nonreciprocal systems and magneto-optical effects are crucial for advanced optical devices.
  • Understanding light-matter interactions, particularly spin angular momentum transfer, is key to novel functionalities.

Purpose of the Study:

  • To predict and analyze a transverse radiative heat flux induced by photon spin angular momentum gradients.
  • To investigate this phenomenon as a thermal analog of the inverse spin Hall effect in specific magneto-optical systems.

Main Methods:

  • Theoretical analysis of radiative heat flux in nonreciprocal systems.
  • Modeling magneto-optical networks with C4 symmetry under spatially varying magnetic fields.

Main Results:

  • Prediction of a transverse radiative heat flux driven by photon spin angular momentum gradients.
  • Demonstration of this effect in C4-symmetric magneto-optical networks.

Conclusions:

  • The study introduces a novel thermal effect with potential applications in thermal management.
  • Localized control of photon spin angular momentum offers new pathways for energy conversion in nonreciprocal systems.