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Related Concept Videos

Induced Electric Dipoles01:28

Induced Electric Dipoles

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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
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Induced Electric Fields01:23

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The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
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Electric Field of Two Equal and Opposite Charges01:30

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Atoms generally contain the same number of positively and negatively charged particles, protons, and electrons. Hence, they are electrically neutral. However, the centers of the positive and negative charges do not always coincide. In such a scenario, the electric field of an atom may not be zero.
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Induced Electric Fields: Applications01:27

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An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
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Consider two point charges, each exerting Coulomb force on the other. It is possible to describe the Coulomb interaction via an intermediate step by defining a new physical quantity called the electric field.
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The three-dimensional representation of the electric field of a positive point charge requires tracing the electric field vectors, whose lengths decrease as the square of their distance from the charge and which point away from the charge at each point. This vector field is no doubt challenging to visualize. The visualization of electric fields becomes quickly intractable as the number of charges increases.
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Interlayer Electric Multipoles Induced by In-Plane Field from Quantum Geometric Origins.

Huiyuan Zheng1,2, Dawei Zhai1,2, Cong Xiao2,3

  • 1New Cornerstone Science Laboratory, Department of Physics, The University of Hong Kong, Hong Kong, China.

Nano Letters
|June 20, 2024
PubMed
Summary

We demonstrate electric fields can control charge transfer in 2D materials, generating electrical multipoles. This quantum geometric effect offers new ways to manipulate layered materials.

Keywords:
Anomalous electric polarizationElectric multipolesIn-plane electric fieldQuantum geometryTwisted bilayers and trilayers

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Two-dimensional (2D) materials exhibit unique electronic properties due to quantum confinement.
  • Interlayer interactions in layered 2D materials are crucial for their emergent phenomena.
  • Understanding charge dynamics in response to external fields is key for novel electronic devices.

Purpose of the Study:

  • To investigate the generation of electrical multipoles via interlayer charge transfer in 2D materials.
  • To explore the role of quantum geometric properties (Berry curvature and quantum metric) in this phenomenon.
  • To demonstrate electric field control over the layer degree of freedom in 2D systems.

Main Methods:

  • Theoretical modeling of charge transfer dynamics in response to in-plane electric fields.
  • Analysis of quantum geometric origins, including Berry curvature and quantum metric.
  • Symmetry characterization of linear and nonlinear electrical responses.
  • Investigation of transition metal dichalcogenide (TMD) bilayers and trilayers.
  • Study of effects during topological phase transitions induced by interlayer translation.

Main Results:

  • In-plane electric fields drive interlayer charge transfer, generating linear (dipole) and second-order nonlinear (quadrupole) electrical multipoles.
  • These effects originate from quantum geometric properties in extended parameter spaces of layered materials.
  • Sizable dipole and quadrupole polarizations are demonstrated in twisted TMD bilayers and trilayers.
  • The charge transfer and multipole generation are significantly enhanced near topological phase transitions tuned by interlayer translation.

Conclusions:

  • A novel mechanism for electric control of interlayer charge transfer and multipole generation in 2D materials is established.
  • Quantum geometry, specifically Berry curvature and quantum metric, governs these linear and nonlinear electrical responses.
  • The findings offer a new pathway for electrical manipulation of the layer degree of freedom in 2D materials, with potential applications in next-generation electronics.