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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Coherent control through phonon anharmonicity.

Gili Scharf1, Tomer Hasharoni1, Lara Donval1

  • 1Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv, Israel.

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|April 27, 2026
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Summary

Researchers directly measured and controlled phonon anharmonicity using ultrafast spectroscopy. This technique offers new insights into lattice dynamics and nonlinear optical phenomena.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spectroscopy

Background:

  • Anharmonic lattice vibrations are crucial for many physical phenomena.
  • Direct measurement of phonon anharmonicity is challenging, especially for Raman-active modes.
  • Current methods often rely on indirect probing of anharmonicity.

Purpose of the Study:

  • To directly measure and control the anharmonicity of single Raman modes.
  • To disentangle anharmonic contributions from quasi-harmonic effects.
  • To explore dynamic control of phonon anharmonicity.

Main Methods:

  • Ultrafast double pump-probe spectroscopy.
  • Direct observation of Raman phonon frequency shifts versus oscillation amplitude.
  • Coherent displacive phononic excitation.

Main Results:

  • Demonstrated direct measurement of phonon anharmonicity in SnTe and SnSe.
  • Successfully disentangled anharmonicity from temperature and carrier density effects.
  • Showcased dynamic control of phonon anharmonicity via electron-phonon coupling.

Conclusions:

  • Ultrafast spectroscopy provides a direct method for studying phonon anharmonicity.
  • The developed methodology allows for precise control and understanding of lattice dynamics.
  • This approach can elucidate mechanisms behind nonlinear optical phenomena.