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Related Concept Videos

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...
IR Absorption Frequency: Delocalization01:04

IR Absorption Frequency: Delocalization

Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
In IR spectroscopy,...
IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that stretch at a...
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Related Experiment Video

Updated: May 14, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
15:58

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

Charge-induced coherence between intersubband plasmons in a quantum structure.

A Delteil1, A Vasanelli, Y Todorov

  • 1Université Paris Diderot, Sorbonne Paris Cité, Laboratoire Matériaux et Phénomènes Quantiques, UMR7162, 75013 Paris, France.

Physical Review Letters
|February 2, 2013
PubMed
Summary

Researchers explored a semiconductor system where light-matter interactions are amplified. They found a single, sharp resonance in the optical response, concentrating the system's oscillator strength into one bright multisubband plasmon.

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Last Updated: May 14, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Published on: October 13, 2017

Area of Science:

  • Condensed matter physics
  • Quantum optics
  • Semiconductor nanostructures

Background:

  • Light-matter interactions are crucial in low-dimensional semiconductor systems.
  • Cooperative behavior of dipolar oscillators can enhance optical responses.
  • Phase locking via Coulomb interaction influences system dynamics.

Purpose of the Study:

  • To investigate enhanced light-matter interaction in a low-dimensional semiconductor system.
  • To demonstrate the formation of a single sharp resonance due to cooperative effects.
  • To explore achieving ultrastrong coupling regimes at room temperature.

Main Methods:

  • Experimental investigation of a semiconductor quantum well with multiple occupied subbands.
  • Theoretical modeling of cooperative dipolar oscillator behavior and Coulomb interaction.
  • Tuning cooperative excitation into resonance with a cavity mode.

Main Results:

  • A single sharp resonance in the optical response was observed, attributed to a bright multisubband plasmon.
  • The entire oscillator strength of the 2D system concentrated into this single resonance.
  • Monotonic increase in coupling strength with electronic density, enabling ultrastrong coupling.

Conclusions:

  • Cooperative phase-locked dipolar oscillators lead to a concentrated optical resonance in semiconductors.
  • This phenomenon allows the concentration of oscillator strength independent of potential shape.
  • Ultrastrong coupling regimes are achievable at room temperature by coupling to cavity modes.