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The results are compared with those in the case of one-photon absorption process. The calculations demonstrate that two-photon absorption process is sufficient strong to be detected in CR. | CYCLOTRON RESONANCE VIA TWO-PHOTON ABSORPTION PROCESS IN CYLINDRICAL QUANTUM WIRE LE DINH - LE TRUNG DUNG College of Education - Hue University HUYNH VINH PHUC Dong Thap University Abstract: Cyclotron resonance (CR) in cylindrical quantum wire (CQW) is investigated via the two-photon absorption process. Expressions for absorption power are obtained when electrons are scattered by acoustic phonons. The CR peaks in the absorption spectrum due to transitions between Landau levels in the case of one- and two-photon absorption process are indicated. From curves on graphs of the absorption power as a function of photon frequency, we obtain CR-linewidth as profiles of the curves by using profile method. The temperature and magnetic field dependence of the absorption power and CR-linewidth are considered. The results are compared with those in the case of one-photon absorption process. The calculations demonstrate that two-photon absorption process is sufficient strong to be detected in CR. Keywords: Cyclotron resonance, two-photon absortion process, cylindrical quantum wire 1. INTRODUCTION Cyclotron resonance is known as a good tool for investigating the electron-phonon interaction in the presence of a magnetic field. This effect has been studied both theoretically and experimentally in bulk semiconductors [1, 2, 3], quantum wells [4, 5, 6, 7], quantum wires [8, 9], quantum dots [10, 11] and graphene [12]. In these works, the main CR peak occurs at ω = ωc , where ω and ωc are the frequencies of the electromagnetic wave and cyclotron, respectively. In these studies, CR has been examined under the one-photon absorption process. However, the study of CR via the two-photon absorption process has not been found. Journal of Sciences and Education, Hue University’s College of Education ISSN 1859-1612, No. 3(31)/2014: pp. 5-13 6 LE DINH et al. Multi-photon absorption process occurs when two or more photons are simultaneously absorbed by the material [13]. Recently, the .
