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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.
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Diamagnetism01:26

Diamagnetism

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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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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...
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Double Resonance Techniques: Overview01:12

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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.
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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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Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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Off-Axis Magnetic Sensing via Dissipative Spin Dynamics Probed by Time-Resolved Fluorescence in Diamond.

Baiqiang Zhu1,2, Fei Liu1, Jia-Xin Peng3

  • 1School of Physics, Hefei University of Technology, Hefei, Anhui 230009, China.

Nano Letters
|October 1, 2025
PubMed
Summary

This study introduces a new method for magnetic field sensing using nitrogen-vacancy (NV) centers in diamond. It bypasses spin coherence limitations by analyzing fluorescence dynamics for robust magnetic field detection.

Keywords:
Dissipative Spin DynamicsMagnetic SensingNV CenterTime-Resolved Fluorescence

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Area of Science:

  • Quantum sensing
  • Diamond quantum technologies
  • Spin physics

Background:

  • Nitrogen-vacancy (NV) centers in diamond are promising for magnetic field sensing.
  • Current methods rely on spin coherence, which is vulnerable to noise and dephasing.

Purpose of the Study:

  • To develop an alternative magnetic field sensing protocol for NV centers.
  • To overcome limitations of spin coherence in NV-diamond magnetometry.
  • To enable off-axis magnetic field detection without relying on spin coherence.

Main Methods:

  • Exploiting dissipative spin dynamics probed by time-resolved fluorescence.
  • Utilizing spin-dependent transition channels under continuous optical excitation.
  • Developing a parameter estimation framework based on photoluminescence trajectories.

Main Results:

  • Demonstrated a protocol for extracting off-axis magnetic field information.
  • Showcased robustness against spin dephasing and magnetic noise via simulations.
  • Achieved stable estimation performance even with short coherence times.
  • Experimentally validated the method for off-axis field reconstruction.

Conclusions:

  • The dissipative spin dynamics protocol offers a robust alternative for NV-diamond magnetometry.
  • The method is adaptable to other spin defect platforms like silicon carbide and hexagonal boron nitride.
  • This approach expands the utility of fluorescence-based sensing in quantum technologies.