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Related Concept Videos

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
Induced Electric Dipoles01:28

Induced Electric Dipoles

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...
Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

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.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity.
Susceptibility, Permittivity and Dielectric Constant01:26

Susceptibility, Permittivity and Dielectric Constant

When placed in an external electric field, a dielectric material gets polarized. The charge density in the dielectric material is given by the sum of the bound and free charge densities, while the total charge density can also be written in terms of the total electric field. The bound charge density can be measured in terms of polarization, leading to the relationship between electric displacement and polarization.
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...

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Related Experiment Video

Updated: Jul 4, 2026

Hyperpolarized Xenon for NMR and MRI Applications
16:20

Hyperpolarized Xenon for NMR and MRI Applications

Published on: September 6, 2012

Electrically injected cavity polaritons.

L Sapienza1, A Vasanelli, R Colombelli

  • 1Laboratoire Matériaux et Phénomènes Quantiques, Université Paris Diderot-Paris 7, 75013 Paris, France.

Physical Review Letters
|June 4, 2008
PubMed
Summary
This summary is machine-generated.

Researchers created an electroluminescent device demonstrating light-matter strong coupling. Electrons can be selectively injected into polariton states, even at room temperature, advancing quantum cascade devices.

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Area of Science:

  • Quantum physics
  • Optoelectronics
  • Semiconductor devices

Background:

  • Light-matter interactions are crucial for optoelectronic devices.
  • Quantum cascade structures offer unique electronic and optical properties.
  • Microcavities enhance light-matter coupling.

Purpose of the Study:

  • To demonstrate light-matter strong coupling in a quantum cascade structure.
  • To investigate electron injection into polariton states.
  • To explore the potential for room-temperature operation.

Main Methods:

  • Fabrication of a GaAs/AlGaAs quantum cascade structure within a planar microcavity.
  • Electroluminescence and reflectivity measurements.
  • Analysis of spectral features under electrical injection and varying bias.

Main Results:

  • Observation of polariton anticrossing between intersubband transitions and cavity modes at zero bias.
  • Significant spectral changes in emitted light under electrical injection.
  • Demonstration of selective electron injection into polariton states up to room temperature.

Conclusions:

  • Electroluminescent devices can operate in the light-matter strong-coupling regime.
  • Selective electron injection into polariton states is achievable.
  • Room-temperature operation of such devices is feasible, paving the way for advanced optoelectronics.