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Related Concept Videos

Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

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...
Induced Electric Fields01:23

Induced Electric Fields

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...
Transmission Electron Microscopy01:15

Transmission Electron Microscopy

In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400 keV in...

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Related Experiment Video

Updated: May 14, 2026

Detection and Quantification of Tunneling Nanotubes Using 3D Volume View Images
12:45

Detection and Quantification of Tunneling Nanotubes Using 3D Volume View Images

Published on: August 31, 2022

Tunneling processes induced by terahertz electric fields.

S D Ganichev1, I N Yassievich, W Prettl

  • 1Institut für Experimentelle und Angewandte Physik, Universität Regensburg, 93040 Regensburg, Germany ; Russian Academy of Sci, A.F. Ioffe Physico-Technical Institute, 194021 St. Petersburg, Russia.

Journal of Biological Physics
|January 25, 2013
PubMed
Summary
This summary is machine-generated.

Tunneling probability drastically increases with terahertz frequency electric fields. Electrons absorb energy during tunneling, reducing the barrier width and lowering required electric field strength.

Keywords:
Electron and nucleus tunnelingterahertz fields

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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

Published on: July 8, 2013

Area of Science:

  • Solid-state physics
  • Quantum mechanics
  • Terahertz science

Background:

  • Electron tunneling is a fundamental quantum mechanical phenomenon.
  • Terahertz (THz) frequency fields offer unique interactions with matter.
  • Understanding field-induced tunneling is crucial for THz applications.

Purpose of the Study:

  • Investigate electron tunneling processes induced by THz electric fields.
  • Quantify the effect of THz frequency on tunneling probability.
  • Elucidate the physical mechanisms behind THz-enhanced tunneling.

Main Methods:

  • Theoretical investigation of electron tunneling dynamics.
  • Analysis of tunneling probability under varying THz field frequencies.
  • Modeling of electron energy absorption and barrier modification.

Main Results:

  • Observed a drastic enhancement of tunneling probability at high frequencies (ωτ(e) ≫ 1).
  • A seven-fold increase in frequency reduced the required electric field strength by three orders of magnitude.
  • Identified electron energy absorption from the THz field as the key mechanism.

Conclusions:

  • THz electric fields significantly enhance electron tunneling probability.
  • The enhanced tunneling is attributed to reduced effective barrier width via energy absorption.
  • This finding has implications for THz-driven electron emission and quantum device applications.