Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Problem-Solving: Tuning of a Guitar String01:04

Problem-Solving: Tuning of a Guitar String

1.1K
In the case of stringed instruments like the guitar, the elastic property that determines the speed of the sound produced is its linear mass density or the mass per unit length. This is simply called the linear density. If the string's linear density is constant along the string, then the linear density is simply the total mass divided by the total length.
The string's wave speed can be regulated by varying the linear density. Tension is the other property that determines the speed of...
1.1K
Angular Momentum about an Arbitrary Axis01:11

Angular Momentum about an Arbitrary Axis

480
Imagine a rigid body with a mass denoted as 'm', which has its center of mass at point G and is rotating around an inertial reference frame. The angular momentum at an arbitrary point P can be calculated by taking the cross product of the position vector and linear momentum vector for each individual mass element.
The velocity of a mass element comprises its translational velocity and the relative velocity instigated by the body's rotation. Substituting the velocity equation into...
480
Bending of Material: Problem Solving01:09

Bending of Material: Problem Solving

597
In this lesson, determine the ratio of the maximum bending moments applied to two metal pipes, given that both pipes can withstand a maximum stress of 100 MPa. Both pipes have an outer radius of 1.8 cm. Pipe A has an inner radius of 1.5 cm, and Pipe B has an inner radius of 1 cm. The ratio of the maximum bending moment applied to two metallic pipes, each with a different inner and outer radius, is determined by considering their dimensions. The inner radius of the first pipe is 1.5 cm, and for...
597
Unsymmetric Bending - Angle of Neutral Axis01:15

Unsymmetric Bending - Angle of Neutral Axis

923
Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal...
923
Rotation of Asymmetric Top01:11

Rotation of Asymmetric Top

1.6K
By definition, a spherically symmetric body has the same moment of inertia about any axis passing through its center of mass. This situation changes if there is no spherical symmetry. Since most rigid bodies are not spherically symmetric, these require special treatment.
The relationship between the angular momentum of any rigid body and its angular velocity, both of which are vectors, involves the moment of inertia. The moment of inertia is a scalar quantity only for spherically symmetric...
1.6K
Angular Momentum: Single Particle01:10

Angular Momentum: Single Particle

7.9K
Angular momentum is directed perpendicular to the plane of the rotation, and its magnitude depends on the choice of the origin. The perpendicular vector joining the linear momentum vector of an object to the origin is called the “lever arm.” If the lever arm and linear momentum are collinear, then the magnitude of the angular momentum is zero. Therefore, in this case, the object rotates about the origin such that it lies on the rim of the circumference defined by the lever arm...
7.9K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Perceptions of Aging from Persons Living and Aging with HIV: A Qualitative Study.

Healthcare (Basel, Switzerland)·2026
Same author

The Effect of Applied Hydrostatic Pressures in Ferromagnetic Ordered HoM<sub>2</sub> [M = (Al, Ni)] Laves Phases: A DFT Study.

Materials (Basel, Switzerland)·2025
Same author

Piezoresponse in WO<sub>3</sub> Thin Films Enhanced by Pt-Nanoparticles as Revealed by Atom Probe Tomography and Cs-Transmission Electron Microscopy.

ACS omega·2025
Same author

Gut microbiome and clinical and lifestyle host factors associated with recurrent positive RT-PCR for SARS-CoV-2.

Frontiers in cellular and infection microbiology·2025
Same author

One-step sputtering of MoSSe metastable phase as thin film and predicted thermodynamic stability by computational methods.

Scientific reports·2024
Same author

Immunogenicity and efficacy of a novel multi-patch SARS-CoV-2/COVID-19 vaccine candidate.

Frontiers in immunology·2023

Related Experiment Video

Updated: Feb 25, 2026

Fabricating van der Waals Heterostructures with Precise Rotational Alignment
09:25

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

Published on: July 5, 2019

10.2K

Band Gap Tuning in 2D Layered Materials by Angular Rotation.

Javier Polanco-Gonzalez1, Jesús Alfredo Carranco-Rodríguez2, José L Enríquez-Carrejo1

  • 1Departamento de Física y Matemáticas, Instituto de Ingeniería y Tecnología, Universidad Autónoma de Cd. Juárez, Avenida del Charro #450 N. Cd. Juárez, Chihuahua C.P. 32310, Mexico.

Materials (Basel, Switzerland)
|August 5, 2017
PubMed
Summary

Computer simulations reveal that twisting layered materials like molybdenum disulfide and graphene can induce metallic properties. This transition to a metallic state occurs around an 8° rotational angle, impacting electronic structure.

Keywords:
HRTEMMoS2Moiré patternsWS2WSe2graphene

More Related Videos

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
13:56

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

8.4K
Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
09:39

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

Published on: June 28, 2024

1.7K

Related Experiment Videos

Last Updated: Feb 25, 2026

Fabricating van der Waals Heterostructures with Precise Rotational Alignment
09:25

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

Published on: July 5, 2019

10.2K
Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
13:56

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

8.4K
Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
09:39

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

Published on: June 28, 2024

1.7K

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Layered two-dimensional (2D) materials exhibit unique electronic properties influenced by their atomic arrangement.
  • Moiré patterns, arising from the superposition of twisted crystalline structures, can significantly alter material characteristics.
  • Understanding the interplay between twist angle and electronic properties is crucial for novel electronic device design.

Purpose of the Study:

  • To investigate the impact of rotational stacking on Moiré pattern formation in 2D materials.
  • To explore the resulting electronic structure changes, including band structure and density of states.
  • To identify critical twist angles that induce significant electronic transitions, such as metallicity.

Main Methods:

  • High-resolution transmission electron (HRTEM) simulations were employed to model Moiré patterns at various twist angles (3°, 5°, 8°, 16°).
  • Density functional theory (DFT) methods, utilizing the Cambridge Serial Total Energy Package (CASTEP) with a generalized gradient approximation, were used for electronic structure calculations.
  • Simulations were performed on layered materials including molybdenum disulfide, graphene, tungsten disulfide, and tungsten selenide.

Main Results:

  • Moiré patterns were successfully simulated for different twist angles in various 2D layered materials.
  • Electronic structure calculations revealed significant changes in band structure and density of states.
  • A notable transition towards a metallic electronic state was observed for most systems when the twist angle approached 8°.

Conclusions:

  • The twist angle between stacked 2D material layers is a critical parameter for tuning their electronic properties.
  • A critical rotation of approximately 8° can induce a transition to a metallic state in systems like MoS2, WSe2, and graphene.
  • These findings provide insights into the rational design of novel electronic superlattices based on twisted 2D materials.