Polarity reversal of the magnetic field induced component of terahertz radiation from InAs surfaces at high density excitation

Nakajima, M.; Suemoto, T.; Saito, S.
November 2004
Applied Physics Letters;11/15/2004, Vol. 85 Issue 20, p4597
Academic Journal
The excitation density dependence of radiation power and wave forms of the terahertz wave from InAs surface under magnetic fields was investigated. A drastic change of the wave forms was observed at high density excitation and was explained by the polarity reversal of the terahertz wave form induced by the magnetic field. The reversal originates from the crossover of the radiation mechanism of the magnetic induced component from the electrons in the accumulation layer to the diffusion current by the photogenerated electrons at high-density excitation under a magnetic field.


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