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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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Phonon-enhanced nonlinearities in hexagonal boron nitride.

Jared S Ginsberg1, M Mehdi Jadidi2, Jin Zhang3

  • 1Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York, NY, 10027, USA. jsg2208@columbia.edu.

Nature Communications
|November 24, 2023
PubMed
Summary
This summary is machine-generated.

Optical fields drive polar crystals into oscillations, revealing nonlinear processes in hexagonal boron nitride (hBN). This study observes enhanced nonlinearities like four-wave mixing (FWM) and third-harmonic generation, enabling time-resolved crystal motion observation.

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Area of Science:

  • Condensed Matter Physics
  • Nonlinear Optics
  • Materials Science

Background:

  • Polar crystals exhibit collective oscillations when excited by optical fields at resonance frequencies.
  • Increasing phonon mode amplitudes can induce novel nonlinear optical processes.

Purpose of the Study:

  • To investigate optical nonlinearities induced and enhanced by strong phonon resonance in hexagonal boron nitride (hBN).
  • To demonstrate time-resolved observation of crystal motion using nonlinear optical signals.
  • To explore phonon-induced enhancements in high-harmonic generation.

Main Methods:

  • Resonant excitation of hexagonal boron nitride (hBN) using optical fields.
  • Observation and analysis of four-wave mixing (FWM) signals.
  • Measurement of third-harmonic generation enhancements.
  • Theoretical prediction of phonon-induced nonlinear effects.

Main Results:

  • Observed large sub-picosecond duration four-wave mixing (FWM) signals during resonant excitation of hBN.
  • Demonstrated time-resolved observation of hBN crystal motion via FWM.
  • Observed enhanced third-harmonic generation due to resonant pumping of hBN transverse optical phonons.
  • Predicted significant increases in high-harmonic generation efficiencies beyond the third order.

Conclusions:

  • Strong phonon resonance in hBN significantly enhances optical nonlinearities.
  • Four-wave mixing provides a method for time-resolved studies of lattice dynamics.
  • Phonon-induced nonlinearities offer pathways to boost high-harmonic generation.