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Related Concept Videos

Unsymmetric Bending01:18

Unsymmetric Bending

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Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from those in symmetrical bending, and are essential for designing structures to withstand different loading conditions. In unsymmetrical bending, the neutral axis—where stress is zero—does not necessarily align with the geometric axes of the cross-section. The...
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Gauss's Law: Planar Symmetry01:27

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A planar symmetry of charge density is obtained when charges are uniformly spread over a large flat surface. In planar symmetry, all points in a plane parallel to the plane of charge are identical with respect to the charges. Suppose the plane of the charge distribution is the xy-plane, and the electric field at a space point P with coordinates (x, y, z) is to be determined. Since the charge density is the same at all (x, y) - coordinates in the z = 0 plane, by symmetry, the electric field at P...
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Singularity Functions for Bending Moment01:18

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Singularity functions simplify the representation of bending moments in beams subjected to discontinuous loading, allowing the use of a single mathematical expression. For a supported beam AB, with uniform loading from its midpoint M to the right side end B, the approach involves conceptual 'cuts' at specific points to determine the bending moment in each segment. By cutting the beam at a point between A and M, the bending moment for the segment before reaching midpoint M is represented using a...
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Mohr's circle is a crucial graphical method used to analyze plane strain by plotting strain on a set of cartesian coordinates, where the abscissa is normal strain ∈ and the ordinate is shear strain γ. Similarly to Mohr’s circle for plane stress, two points X and Y are plotted. Their coordinates are (∈x, -γXY) and (∈Y, γXY), respectively.
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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Building Large-Domain Twisted Bilayer Graphene with van Hove Singularity.

Zhenjun Tan1,2, Jianbo Yin1, Cheng Chen3

  • 1Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, P. R. China.

ACS Nano
|May 11, 2016
PubMed
Summary

Researchers developed a scalable method for producing high-quality twisted bilayer graphene (tBLG) with controlled twist angles. This advancement enables enhanced electronic properties and high-performance photodetectors.

Keywords:
interlayer couplingphotocurrent enhancementtwisted bilayer graphenevan Hove singularity

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Twisted bilayer graphene (tBLG) exhibits unique phenomena due to van Hove Singularities (VHS).
  • Scalable, angle-controlled production of high-quality tBLG remains a significant challenge.
  • Interfacial contamination hinders the desired electronic properties in tBLG.

Purpose of the Study:

  • To develop a facile and scalable method for preparing high-quality tBLG with controlled twist angles.
  • To investigate the electronic structure and optical properties of the synthesized tBLG.
  • To fabricate high-performance photodetectors utilizing the unique properties of tBLG.

Main Methods:

  • Layer-by-layer transfer of graphene monolayers without polymer contamination.
  • Angle-resolved photoemission spectroscopy (ARPES) with submicrometer spatial resolution.
  • Fabrication of photodetectors from the synthesized tBLG.

Main Results:

  • Achieved large domain sizes (>100 μm) tBLG with controlled twist angles.
  • Confirmed the formation of minigaps and VHSs in the electronic structure via micro-ARPES.
  • Observed a ~20-fold enhancement in Raman G-band intensity, indicating high quality.
  • Demonstrated photodetectors with up to ~6 times enhanced photocurrent generation.

Conclusions:

  • The developed clean transfer method enables scalable production of high-quality, angle-controlled tBLG.
  • The resulting tBLG exhibits strong light-matter interactions due to VHS.
  • This tBLG is suitable for fabricating high-performance optoelectronic devices like photodetectors.