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Related Concept Videos

Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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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...
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Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

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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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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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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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The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

47.2K
The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.0K
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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Updated: Sep 1, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Strain Quantum Sensing with Spin Defects in Hexagonal Boron Nitride.

Xiaodan Lyu1,2, Qinghai Tan1, Lishu Wu1

  • 1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore.

Nano Letters
|August 12, 2022
PubMed
Summary
This summary is machine-generated.

Hexagonal boron nitride’s boron vacancy centers show potential for quantum sensing. These defects can image strain in two-dimensional devices, paving the way for new quantum technologies.

Keywords:
Raman spectroscopycolor centerhexagonal boron nitrideoptically detected magnetic resonancestrain

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Area of Science:

  • Materials Science
  • Quantum Technologies
  • Condensed Matter Physics

Background:

  • Hexagonal boron nitride (h-BN) is a key 2D material for optoelectronics and quantum technologies.
  • Atom-like defects in h-BN, such as boron vacancy centers (VB-), act as quantum emitters.
  • Understanding the coherence and sensitivity of these defects is crucial for quantum applications.

Purpose of the Study:

  • To investigate the strain sensing capabilities of boron vacancy centers (VB-) in h-BN.
  • To characterize the strain configuration of VB- defects created via ion implantation.
  • To explore the potential of VB- for in situ strain imaging in 2D devices.

Main Methods:

  • Wide-field spatially resolved optically detected magnetic resonance (ODMR).
  • Submicro Raman spectroscopy.
  • Ion implantation to create VB- defects in h-BN flakes.

Main Results:

  • Demonstrated the ability of VB- centers to act as quantum sensors for strain.
  • Successfully probed the strain configuration of ion-implanted VB- defects.
  • Validated VB- centers as a tool for strain detection in h-BN.

Conclusions:

  • Boron vacancy centers in h-BN are effective quantum sensors for strain.
  • The findings enable in situ strain imaging in 2D devices containing h-BN.
  • This research advances the application of h-BN in quantum sensing and 2D electronics.