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Related Concept Videos

Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

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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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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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When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
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Van de Graaff generators (or Van de Graaffs) are devices used to demonstrate high voltage due to static electricity that can also be used for research. Robert Van de Graaff first built one in 1931 (based on original suggestions by Lord Kelvin) for use in nuclear physics research.
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Gauss' law relates the electric flux through a closed surface to the net charge enclosed by that surface. Gauss's law can be applied to find the electric field and the charge enclosed in a region depending on its charge distribution.
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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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Related Experiment Video

Updated: Aug 23, 2025

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
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Generating intense electric fields in 2D materials by dual ionic gating.

Benjamin I Weintrub1, Yu-Ling Hsieh1,2, Sviatoslav Kovalchuk1

  • 1Department of Physics, Freie Universität Berlin, Berlin, Germany.

Nature Communications
|November 4, 2022
PubMed
Summary
This summary is machine-generated.

Researchers applied intense electric fields to two-dimensional materials (2DMs) using ionic liquids, overcoming previous limits. This enabled a semiconductor-to-metal transition in WSe2, opening new research avenues.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Electric fields significantly alter the electronic properties of two-dimensional materials (2DMs).
  • Conventional devices are limited by dielectric breakdown (≤0.3 V/nm), restricting achievable electric field strengths.
  • 2DMs exhibit tunable bandgaps, crucial for electronic applications.

Purpose of the Study:

  • To overcome the electric field strength limitations in 2DMs.
  • To investigate phenomena occurring under intense electric fields.
  • To induce and study semiconductor-to-metal transitions in 2DMs.

Main Methods:

  • Suspending a 2DM between two volumes of ionic liquid (IL) with independently controlled potentials.
  • Utilizing the electrical double layers formed at the IL-2DM interface to enhance the electric field.
  • Applying electric fields exceeding 4 V/nm.

Main Results:

  • Achieved electric field strengths over an order of magnitude higher than conventional methods.
  • Successfully closed the bandgap of few-layer tungsten diselenide (WSe2).
  • Drove a semiconductor-to-metal transition in WSe2.

Conclusions:

  • Ionic liquid gating provides a novel pathway to achieve ultra-high electric fields in 2DMs.
  • Ultra-high electric fields enable the exploration of new electronic states and transitions in 2D materials.
  • This technique opens doors to studying novel phenomena in intense electric fields.