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Raman scattering from a two-dimensional electron gas in a weakly and periodically modulated magnetic field

✍ Scribed by V. Fessatidis; H.L. Cui; P. Vasilopoulos

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
93 KB
Volume
23
Category
Article
ISSN
0749-6036

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✦ Synopsis

An analysis of light scattering from a two-dimensional electron gas (2DEG) subject to a weak periodic magnetic modulation of strength B m and to a perpendicular uniform magnetic field B of arbitrary strength is presented. Raman spectra are calculated for (i) electron inter-Landau-level transitions, which result in a Raman shift ∼2Ο‰ c , and (ii) inter-Landau-level collective electron excitations at a hybridized magnetoplasmon frequency and at a new lowfrequency, intra-Landau-level plasmon mode induced by the modulation. The dependence of the Raman cross sections on the strength of B and B m is assessed. The effect of a weak B m on the Raman spectrum is similar to that of a weak electric modulation but the signals from the magnetically modulated 2DEG are much stronger. The combined effect of the electric and magnetic modulations is also considered.

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