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Related Concept Videos

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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,...
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.
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 have a...
Synthetic Disvision of Polynomials01:28

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Synthetic division is an efficient algorithmic approach for dividing a polynomial by a linear binomial of the form x - c, where c is a real number. This method is helpful due to its streamlined process, which avoids the more cumbersome steps involved in the traditional long division of polynomials. It simplifies computation and serves as a practical tool for evaluating polynomials and identifying their factors.To perform synthetic division, one begins by listing the coefficients of the...
Three-Winding Transformers01:19

Three-Winding Transformers

Three identical single-phase transformers can be configured to form a three-phase transformer connection, which involves high-voltage and low-voltage windings. The high-voltage windings are denoted by capital letters A-B-C, while the low-voltage windings are labeled with lowercase letters a-b-c, representing their respective phases. This notation helps distinguish between the high and low voltage sides of the transformer.
In the per-unit equivalent circuit of a grounded Y-Y three-phase...

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Updated: Jul 2, 2026

Scanning SQUID Study of Vortex Manipulation by Local Contact
06:53

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Published on: February 1, 2017

Multi-Q spin-valley order in twisted WSe2.

Arthur Bril1, Nai Chao Hu1, Nick Bultinck1

  • 1Department of Physics and Astronomy, Ghent University, Krijgslaan 281, 9000 Gent, Belgium.

Npj Quantum Materials
|July 1, 2026
PubMed
Summary

Researchers discovered novel magnetic orders in twisted WSe2 (tungsten diselenide) exhibiting multi-Q states. These complex magnetic patterns emerge from a 120° spin-valley anti-ferromagnet, expanding the unit cell and offering new insights into correlated electron systems.

Keywords:
Materials sciencePhysics

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Last Updated: Jul 2, 2026

Scanning SQUID Study of Vortex Manipulation by Local Contact
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Published on: March 24, 2019

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Magnetism

Background:

  • Twisted transition metal dichalcogenides (TMDs) exhibit strong electron-electron interactions.
  • Moiré superlattices in TMDs host correlated phenomena, including magnetism.

Purpose of the Study:

  • Investigate the interacting phase diagram of 3.65°-twisted WSe2 at moiré hole filling ν = 1.
  • Identify and characterize novel magnetic orders in this system.

Main Methods:

  • Experimental study of the phase diagram.
  • Analysis of magnetic order parameters and their spatial modulation.
  • Investigation of multi-Q magnetic orders (coplanar and non-coplanar).

Main Results:

  • Discovery of previously-overlooked magnetic orders with spatial modulation at M and K points of the moiré Brillouin zone.
  • Identification of multi-Q states as continuous deformations of the 120° spin-valley anti-ferromagnet (AFM) with an expanded unit cell.
  • Stabilization of multi-Q states at experimentally relevant interaction strengths and displacement fields, accompanied by softened spin fluctuations.

Conclusions:

  • The interacting phase diagram of twisted WSe2 hosts complex multi-Q magnetic orders.
  • These findings reveal new avenues for exploring emergent magnetism in moiré heterostructures.
  • The observed phenomena are relevant for understanding correlated electron behavior in low-dimensional materials.