Regensburg 1998 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 24: Poster II
HL 24.141: Poster
Mittwoch, 25. März 1998, 10:30–19:00, A
Cyclotron Resonance Lineshapes in HgSe:Fe-QWs with a Multi-Subband Population — •Oliver Portugall1, Martin Barczewski1, Michael von Ortenberg1, Thorsten Widmer2, Detlef Schikora3, and Herbert Lischka3 — 1Humboldt Universitaet Berlin — 2TU Braunschweig — 3Universitaet/GH Paderborn
In non-parabolic systems the magnetic field position of resonant transitions depends explicitly on the energy level of initial and final quantum states. Equivalent transitions in a multi-subband structure are therefore represented by a distribution of absorption lines along the field axis. The application of high magnetic fields (100 T) and large radiation energies (100 meV) on quantum wells in the 2D-to-3D transition range leads to characteristic lineshapes and finestructures under these conditions. With the Fermi level pinned system HgSe:Fe as a model substance cyclotron resonance lineshapes in quantum wells of various thicknesses have been investigated and numerically simulated. Experimental results obtained in fields up to 200 T are related to the structure and population of subbands as predicted by standard bandstructure calculations.