Jobst, S and Zwerschke, S and Smet, J and Gerhardts, R and Weiss, Dieter and Klitzing, K and Umanski, V (2000) Composite Fermions in a weakly density modulated 2DEG: Directive evidence of a periodic magnetic field around n=1/2. Physica E 6, p. 87.
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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 with minima positions on the magnetic field axis given by 2RC=(ë-1/4)a. Here 2RC is the electron cyclotron diameter at the Fermi- energy and ë an integer. In contrast, we find clear magnetic commensurability features around filling factor with a pronounced minimum for a composite fermion cyclotron radius RC,CF matching 1.25a. This gives direct evidence that the density modulation results in a modulated effective magnetic field for composite fermions. The experimental ñxx-traces around are well described by novel model calculations, based on a semiclassical solution of the Boltzmann equation, taking into account anisotropic scattering.
|Institutions:||Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Dieter Weiss|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||25 May 2009 13:20|
|Last Modified:||05 Aug 2009 13:57|