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Related Concept Videos

Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

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An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque...
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Angle of Twist - Elastic Range01:13

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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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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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Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

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In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
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Three-Winding Transformers01:19

Three-Winding Transformers

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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.
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Bending and torsional moments are two fundamental concepts in structural engineering. They play an important role in understanding the behavior of materials and structures under different loading conditions.
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Related Experiment Video

Updated: Dec 13, 2025

Magnetic Tweezers for the Measurement of Twist and Torque
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Simulating Twistronics without a Twist.

Tymoteusz Salamon1, Alessio Celi2, Ravindra W Chhajlany3

  • 1ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain.

Physical Review Letters
|August 4, 2020
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Summary
This summary is machine-generated.

Researchers propose a novel quantum simulation method using ultracold atoms to emulate twisted bilayer graphene. This technique allows tunable exploration of strongly correlated flatband physics and hybridization, mimicking magic angle effects.

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Area of Science:

  • Quantum Simulation
  • Condensed Matter Physics
  • Atomic Physics

Background:

  • Twisted bilayer graphene exhibits unique electronic properties due to rotational misalignment, leading to strongly correlated behavior.
  • Realizing and studying these complex phenomena in physical materials can be experimentally challenging.

Purpose of the Study:

  • To propose a tunable quantum simulation scheme for emulating twisted bilayer graphene systems using ultracold atoms.
  • To investigate the creation of synthetic bilayer structures and supercells for exploring correlated physics.

Main Methods:

  • Utilizing coherently coupled internal atomic states to create two synthetic layers.
  • Employing a spatially dependent Raman coupling to generate a supercell structure.
  • Focusing on a synthetic square bilayer lattice to demonstrate the concept.

Main Results:

  • Demonstrated the creation of tunable quasiflatbands and Dirac cone spectra in the synthetic system.
  • Identified specific 'magic' supercell periodicities that lead to these characteristic features.
  • Explained the emergence of these features through perturbative analysis.

Conclusions:

  • The proposed scheme offers a highly tunable platform for emulating twisted bilayer graphene physics with ultracold atoms.
  • This approach, implementable with current experimental techniques, facilitates the controlled study of strongly correlated flatbands and hybridization.
  • Opens new avenues for quantum simulators to explore phenomena analogous to magic angle bilayer graphene.