Publikation:

Infrared-Phonon Polariton Resonance of the Nonlinear Susceptibility in GaAs

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PRL_dekorsy_2003.pdf
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2003

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Yakovlev, Vladislav A.
Seidel, Wolfgang
Helm, Manfred
Keilmann, Fritz

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Physical review letters. 2003, 90(5), 55508. Available under: doi: 10.1103/PhysRevLett.90.055508

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Nonlinear probing of the fundamental lattice vibration of polar crystals is shown to reveal insight into higher-order cohesive lattice forces. With a free-electron laser tunable in the far infrared we experimentally investigate the dispersion of the second-order susceptibility due to the phonon resonance in GaAs. We observe a strong resonance enhancement of second harmonic light generation at half the optical phonon frequency, and in addition a minimum at a higher frequency below the phonon frequency. Measuring this frequency and comparison to a theoretical model allows the determination of competing higher-order lattice forces.

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ISO 690DEKORSY, Thomas, Vladislav A. YAKOVLEV, Wolfgang SEIDEL, Manfred HELM, Fritz KEILMANN, 2003. Infrared-Phonon Polariton Resonance of the Nonlinear Susceptibility in GaAs. In: Physical review letters. 2003, 90(5), 55508. Available under: doi: 10.1103/PhysRevLett.90.055508
BibTex
@article{Dekorsy2003Infra-5333,
  year={2003},
  doi={10.1103/PhysRevLett.90.055508},
  title={Infrared-Phonon Polariton Resonance of the Nonlinear Susceptibility in GaAs},
  number={5},
  volume={90},
  journal={Physical review letters},
  author={Dekorsy, Thomas and Yakovlev, Vladislav A. and Seidel, Wolfgang and Helm, Manfred and Keilmann, Fritz},
  note={Article Number: 55508}
}
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