STUDY IN LINE AND SHAPE: CYCLOTRON RESONANCE IN InSb USING AN INFRARED LASER.
JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB
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An experimental and theoretical study of the shape of electron cyclotron resonance lines in n-type InSb has been made, using a far infrared gas laser as a signal source, and the quantum plasma dielectric tensor as the mathematical model describing the resonant process. The laser wavelengths ranged from 337 to 48 micrometers the sample temperature was either 4.2 or 77 K. At liquid He temperature, an anomalous narrowing of the resonance lines is observed as the resonant magnetic field is increased, which the theory ascribes to the decreasing efficacy of ionized impurity scattering in causing Landau level transitions at high magnetic fields. Strong electron and photon interactions with the optical phonon modes are observed via greatly rebroadened lines as the magnetic field approaches 30 kG. Impurity resonant transitions are also observed having harmonics up to the fifth. At 77 K the cyclotron resonance has nearly the width expected if phonon scattering alone were at work. Author
- Solid State Physics