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¹H NMR: Long-Range Coupling

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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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.
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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.
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Strain regulated interlayer coupling in WSe2/WS2heterobilayer.

Xiaodan Xu1,2, Cong Wang3, Wenqi Xiong4

  • 1Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, People's Republic of China.

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Strain engineering precisely tunes the properties of 2D materials like WSe2/WS2 heterostructures. Applying tensile strain modifies electronic structures and enhances interlayer coupling, impacting material performance.

Keywords:
WSe2/WS2interlayer couplingstrain engineering

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Strain engineering is a key method for tuning the properties of two-dimensional (2D) materials by altering atomic lattice parameters.
  • Understanding strain-regulated interlayer coupling in heterostructures is crucial for developing advanced electronic and optoelectronic devices.

Purpose of the Study:

  • To systematically investigate the effects of strain engineering on WSe2/WS2 heterostructures and their constituent monolayers.
  • To explore how strain influences phonon energies, exciton emissions, and electronic band structures.

Main Methods:

  • Experimental characterization using Raman spectroscopy and photoluminescence spectroscopy.
  • Systematic application of tensile strain to WSe2/WS2 heterostructures and monolayers.
  • Analysis of spectral changes to determine strain-induced property modifications.

Main Results:

  • Strain significantly modulates phonon energy and exciton emission in both monolayers and heterostructures.
  • Tensile strain tunes the electronic band structure of WSe2/WS2 heterostructures.
  • Interlayer coupling is enhanced by tensile strain, and the photoluminescence intensity ratio of WS2 to WSe2 increases monotonically with strain.

Conclusions:

  • Strain engineering offers precise control over the physical properties of 2D materials at the atomic scale.
  • The findings provide a deeper understanding of strain effects in 2D heterostructures, enabling new applications.
  • This work highlights the potential of strain engineering for nanometer-scale device optimization.