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Composite Fermions in a weakly density modulated 2DEG: Directive evidence of a periodic magnetic field around n=1/2

Jobst, S. ; Zwerschke, S. ; Smet, J. ; Gerhardts, R. ; Weiss, Dieter ; Klitzing, K. ; Umanski, V.


We investigate the magnetoresistance of a weakly density modulated high mobility two- dimensional electron system around filling factor . The density modulation with periods a between 300 nm and 500 nm was generated by in situ interferometric illumination. At low B we found commensurability oscillations of the magnetoresistance characteristic for transport in weak electrostatic potentials ...


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