In Condensed Matter Physics
Within a solid the mass in the cyclotron frequency equation above is replaced with the effective mass tensor . Cyclotron resonance is therefore a useful technique to measure effective mass and Fermi surface cross-section in solids. In a sufficiently high magnetic field at low temperature in a relatively pure material
where is the carrier scattering lifetime, is Boltzmann's constant and is temperature. When these conditions are satisfied, an electron will complete its cyclotron orbit without engaging in a collision, at which point it is said to be in a well-defined Landau level.
Read more about this topic: Electron Cyclotron Resonance
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