Lattice Vibrations

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
(No Transcript)
5
(No Transcript)
6

• Maxwell-Bolzmann
• Fermi-Dirac
• Bose-Einstein
• Phonons
• BOSONS
• integer spin

7
Phonon and Solid State

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

8
3. Phonon and Superconductivity
9

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

10

• Thank you