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Lattice Vibrations – Phonons in Solids

Lattice Vibrations – Phonons in Solids. Alex Mathew University of Rochester. What is a phonon?. Phonon – Quantum of lattice vibration Photon – Quantum of electromagnetic radiation Important Concept in Solid State Physics. Origin of phonon. Lattice – Harmonic Oscillators

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Lattice Vibrations – Phonons in Solids

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  1. Lattice Vibrations – Phonons in Solids Alex Mathew University of Rochester

  2. What is a phonon? • Phonon – Quantum of lattice vibration • Photon – Quantum of electromagnetic radiation • Important Concept in Solid State Physics

  3. Origin of phonon • Lattice – Harmonic Oscillators • Two solution to equations of motion • Optical mode Associated with radiation interaction • Acoustic mode

  4. Maxwell-Bolzmann Fermi-Dirac Bose-Einstein Phonons BOSONS integer spin

  5. Phonon and Solid State • Specific Heat T3 dependence at low temperature 2. Thermal and Electrical Conductivity Phonons- Heat carriers in non-metals

  6. 3. Phonon and Superconductivity

  7. Transmission of Sound Long-wavelength phonons • Reflectivity of Ionic Crystals • Vibrational Spectroscopy Raman scattering – Optical Phonons Brillouin scattering – Acoustic Phonons

  8. Thank you

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