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Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
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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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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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According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
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Twist Angle-Dependent Exciton Mobility in WS2 Bilayers.

Yangguang Zhong1,2, Shuai Yue2,3, Jieyuan Liang1,4

  • 1Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometriscs and College of Materials Science and Engineering, Hunan University, Changsha, Hunan 410082, China.

Nano Letters
|March 4, 2025
PubMed
Summary

Twist angle significantly impacts exciton transport in bilayer tungsten disulfide (WS2). Stronger interlayer coupling enhances exciton mobility, crucial for developing advanced excitonic devices.

Keywords:
exciton diffusioninterlayer couplingmoiré effectstransient reflection microscopytwisted bilayer WS2

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Bilayer tungsten disulfide (WS2) is promising for excitonic devices due to its unique properties.
  • Understanding twist angle effects on exciton transport is limited.

Purpose of the Study:

  • To systematically investigate exciton mobility in bilayer WS2 with varying twist angles.
  • To elucidate the roles of interlayer coupling and moiré potential in exciton transport.

Main Methods:

  • Transient reflection microscopy (TRM) was used to study exciton mobility.
  • Chemical vapor deposition (CVD) grown bilayer WS2 with controlled twist angles was employed.

Main Results:

  • Exciton mobility was highest (87.3 cm2/V s) at 0° twist angle, with a 1.06 μm diffusion length.
  • Mobility decreased to 44.5 cm2/(V s) at 25° twist due to weakened coupling and moiré effects.
  • 60° twist angle showed intermediate exciton transport characteristics.

Conclusions:

  • Interlayer coupling and moiré potential critically influence exciton transport dynamics.
  • Findings provide guidelines for engineering excitonic devices based on 2D semiconductors.