Lattice-Vibrations – Phonons in Solid State
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Transcript Lattice-Vibrations – Phonons in Solid State
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
Two solution to equations of motion
Optical mode
Associated with radiation interaction
Acoustic mode
Maxwell-Bolzmann
Fermi-Dirac
Bose-Einstein
Phonons
BOSONS
integer spin
Phonon and Solid State
Specific Heat
T3 dependence at low temperature
1.
2. Thermal and Electrical Conductivity
Phonons- Heat carriers in non-metals
3. Phonon and Superconductivity
Transmission of Sound
Long-wavelength phonons
Reflectivity of Ionic Crystals
Vibrational Spectroscopy
Raman scattering – Optical Phonons
Brillouin scattering – Acoustic Phonons
Thank you