Solid State Plasma in the Pulse Modulated Magnetic Field
Z. Jankauskas, S. Barauskas and V. Kvedaras
Department of Electrical Engineering, Vilnius Gediminas Technical University, Saulëtekio av. 11, LT-10223 Vilnius, Lithuania
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Radio frequency (RF) magnetoplasmic waves known as helicons will propagate in solid state plasma of semiconductors when a strong magnetic field is applied. Helicons have an exact analogy with an electromagnetic whistler wave which is frequently propagated in the low density plasma of the Earth ionosphere. In our experiments the modulated magnetic field is being used for excitation of helicons. It is shown that in the case of pulse modulated field along with the RF helicon waves the transient cyclotron frequency oscillations exist in the semiconductor plasma. For observation of the cyclotron radiation frequency οmegac the modulation depth about one percent is sufficient. The measurement of οmegac provides an opportunity to determine the masses of electrons and holes in solid state plasma of semiconductors. In already existing method the absorption of electromagnetic radiation on the cyclotron frequency is being used. For this case it is necessary to have an external infrared generator. In our method the cyclotron radiation is being generated by electrons (or holes) directly and additional external excitation is not needed.
DOI: 10.12693/APhysPolA.115.1025
PACS numbers: 40.41.Cr, 41.20.Jb