tailieunhanh - Wave Propagation Part 15

Tham khảo tài liệu 'wave propagation part 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 482 Wave Propagation wave in low-dimensional systems and the nonlinear absorption of a strong electromagnetic wave in normal bulk semiconductors Pavlovich Epshtein 1977 the nonlinear absorption coefficient in a low-dimensional systems has the same maximum values peaks at Q Wq the electromagnetic wave energies at which a has maxima are not changed as other parameters is varied the nonlinear absorption coefficient in a low-dimensional systems is bigger. The results show a geometrical dependence of a due to the confinement of electrons in low-dimensional systems. The nonlinear absorption in each low-dimensional systems is also different for example these absorption peaks in doped superlattices are sharper than those in quantum wells the nonlinear absorption coefficient in quantum wires is bigger than those in quantum wells and doped superlattices . It shows that the nonlinear absorption of a strong electromagnetic wave by confined electrons depends significantly on the structure of each low-dimensional systems. However in this study we have not considered the effect of confined phonon in low-dimensional systems the influence of external magnetic field or a weak electromagnetic wave on the nonlinear absorption of a strong electromagnetic wave. This is still open for further studying. 7. Acknowledgments This work is completed with financial support from the Vietnam National Foundation for Science and Technology Development NAFOSTED . 8. References Antonyuk V. B. Malshukov A. G. Larsson M. Chao K. A. 2004 . Phys. Rev. B 69 155308. Ariza-Flores A. D. Rodriguez-Vargas I. 2008 . PIER letters 1 159. Bau N. Q. Dinh L. Phong T. C. 2007 . J. Korean. Phys. Soc 51 1325. Bau N. Q. Nhan N. V. Phong T. C. 2002 . J. Korean. Phys. Soc 41 149. Bau N. Q. Phong T. C. 1998 . J. Phys. Soc. Japan 67 3875. Butscher S. Knorr A. 2006 . Phys. Rev. L 97 197401. Epstein E. M. 1975 . Sov. Communicacattion of HEE of USSR Ser. Radio 18 785. Gaggero-Sager M. L. Moreno-Martinez N. .