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

Ampere's Law in Matter01:22

Ampere's Law in Matter

1.2K
The total current density in magnetized material is the sum of the free and bound current densities. The free current arises due to the motion of free electrons within the material, while the bound current arises due to the alignment of magnetic dipole moments.
The differential form of Ampere's law in vacuum states that the curl of the magnetic field equals the permeability times the current density. In a magnetized material, the law is modified to incorporate the free and bound current...
1.2K
Rotation of Asymmetric Top01:11

Rotation of Asymmetric Top

1.4K
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...
1.4K
What is Matter?01:13

What is Matter?

14.5K
The substance of the universe—from a grain of sand to a star—is called matter. Scientists define matter as anything that occupies space and has mass. An object’s mass and its weight are related concepts, but not quite the same. An object’s mass is the amount of matter contained in the object and is the same whether that object is on Earth or in the zero-gravity environment of outer space. An object’s weight, on the other hand, is its mass as affected by the pull of...
14.5K
Active Transport01:14

Active Transport

1.9K
Active transport is a critical biological process that allows cells to move solutes against an electrochemical gradient. This process requires direct energy input and is characterized by its selectivity, saturability, and susceptibility to competitive inhibition.
Primary active transporters, like Na+, K+ and -ATPase, directly utilize ATP to move ions across the membrane. These transporters play significant roles in various physiological processes. For instance, Na+, K+ and -ATPase maintain...
1.9K
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

733
Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
733
DNA Topoisomerases02:02

DNA Topoisomerases

34.5K
Topoisomerases are enzymes that relax overwound DNA molecules during various cell processes, including DNA replication and transcription. These enzymes regulate positive and negative DNA supercoiling without changing the nucleotide sequence. DNA overwinding in a clockwise direction results in positively supercoiled DNA, whereas underwinding in a counterclockwise direction produces negatively supercoiled DNA.
Types and Mechanism of action
Topoisomerases are divided into two main types. ...
34.5K

You might also read

Related Articles

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

Sort by
Same author

Stabilizer Rényi Entropy Encodes Fusion Rules of Topological Defects and Boundaries.

Physical review letters·2026
Same author

Tower of Structured Excited States from Measurements.

Physical review letters·2026
Same author

Hermitian and non-Hermitian topology in active matter.

Reports on progress in physics. Physical Society (Great Britain)·2025
Same author

Dynamic and functional changes in vascular endothelial cell monolayers under combined hypoxic and inflammatory stimuli.

Scientific reports·2025
Same author

Transition from the topological to the chaotic in the nonlinear Su-Schrieffer-Heeger model.

Nature communications·2025
Same author

Sustained inhibition of CSF1R signaling augments antitumor immunity through inhibiting tumor-associated macrophages.

JCI insight·2025
Same journal

Erratum: Bacterial Turbulence at Compressible Fluid Interfaces [Phys. Rev. Lett. 136, 138301 (2026)].

Physical review letters·2026
Same journal

Unveiling Light-Quark Yukawa Flavor Structure via Dihadron Fragmentation at Lepton Colliders.

Physical review letters·2026
Same journal

Adaptable Route to Fast Coherent State Transport via Bang-Bang-Bang Protocols.

Physical review letters·2026
Same journal

Topological Transition and Emergence of Elasticity of Dislocation in Skyrmion Lattice: Beyond Kittel's Magnetic-Polar Analogy.

Physical review letters·2026
Same journal

Pound-Drever-Hall Method for Superconducting-Qubit Readout.

Physical review letters·2026
Same journal

Coupling a ^{73}Ge Nuclear Spin to an Electrostatically Defined Quantum Dot in Silicon.

Physical review letters·2026
See all related articles

Related Experiment Video

Updated: Jan 2, 2026

Forming, Confining, and Observing Microtubule-Based Active Nematics
08:37

Forming, Confining, and Observing Microtubule-Based Active Nematics

Published on: January 13, 2023

3.1K

Anomalous Topological Active Matter.

Kazuki Sone1, Yuto Ashida1,2

  • 1Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

Physical Review Letters
|December 7, 2019
PubMed
Summary
This summary is machine-generated.

Topological sound modes emerge in active matter systems by drawing parallels with quantum anomalous Hall insulators. This research offers design principles for novel topological metamaterials and active metamaterials.

More Related Videos

Controlling Flow Speeds of Microtubule-Based 3D Active Fluids Using Temperature
08:04

Controlling Flow Speeds of Microtubule-Based 3D Active Fluids Using Temperature

Published on: November 26, 2019

7.5K
Tuning the Contractility and Deformation Modes of Active Actin-Based Assemblies In Vitro: From Two-Dimensional Active Networks to Liquid Crystal Drops
06:48

Tuning the Contractility and Deformation Modes of Active Actin-Based Assemblies In Vitro: From Two-Dimensional Active Networks to Liquid Crystal Drops

Published on: July 11, 2025

774

Related Experiment Videos

Last Updated: Jan 2, 2026

Forming, Confining, and Observing Microtubule-Based Active Nematics
08:37

Forming, Confining, and Observing Microtubule-Based Active Nematics

Published on: January 13, 2023

3.1K
Controlling Flow Speeds of Microtubule-Based 3D Active Fluids Using Temperature
08:04

Controlling Flow Speeds of Microtubule-Based 3D Active Fluids Using Temperature

Published on: November 26, 2019

7.5K
Tuning the Contractility and Deformation Modes of Active Actin-Based Assemblies In Vitro: From Two-Dimensional Active Networks to Liquid Crystal Drops
06:48

Tuning the Contractility and Deformation Modes of Active Actin-Based Assemblies In Vitro: From Two-Dimensional Active Networks to Liquid Crystal Drops

Published on: July 11, 2025

774

Area of Science:

  • Condensed Matter Physics
  • Active Matter Physics
  • Acoustic Metamaterials

Background:

  • Active systems exhibit spontaneous flows and can reach nonequilibrium steady states without external drives.
  • Quantum anomalous Hall insulators possess unique topological properties.
  • Bridging these fields can lead to novel material functionalities.

Purpose of the Study:

  • To explore the emergence of topologically protected sound modes in active matter systems.
  • To establish an analogy between quantum anomalous Hall insulators and active matter.
  • To provide design principles for topological metamaterials.

Main Methods:

  • Analogy between quantum anomalous Hall insulators and active matter with spontaneous flows.
  • Analysis of steady-state active systems in continuum space.
  • Numerical calculation of band structure and eigenvectors for a minimal model.

Main Results:

  • Topologically protected sound modes arise in steady-state active systems.
  • Net vorticity in active systems must vanish under realistic conditions.
  • Nonzero bulk topological invariants and corresponding edge sound modes were demonstrated.
  • Emergence of nonzero bulk topological invariants and edge sound modes.

Conclusions:

  • The quantum anomalous Hall effect offers design principles for topological metamaterials.
  • This work introduces a new class of topological active systems.
  • Potential applications in practical active metamaterials and non-Hermitian topological phenomena.