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- W2012169388 abstract "We investigate the magnetoresistance of a weakly density modulated high mobility two-dimensional electron system around filling factor ν=12. 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=(λ−1/4)a. Here 2RC is the electron cyclotron diameter at the Fermi-energy and λ an integer. In contrast, we find clear magnetic commensurability features around filling factor ν=12 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 ρxx-traces around ν=12 are well described by novel model calculations, based on a semiclassical solution of the Boltzmann equation, taking into account anisotropic scattering." @default.
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- W2012169388 date "2000-02-01" @default.
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- W2012169388 title "Composite fermions in a weakly density modulated 2DEG: direct evidence of a periodic magnetic field around" @default.
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- W2012169388 doi "https://doi.org/10.1016/s1386-9477(99)00060-0" @default.
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