Investigations of composite fermions in semiconductor nanostructures

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DOIResolve DOI: http://doi.org/10.1088/0953-8984/8/17/013
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TypeArticle
Journal titleJournal Of Physics. Condensed Matter
Volume8
Issue17
Pages30193032; # of pages: 14
AbstractWe have measured the magnetoresistance of a variety of structures to search for effects associated with composite fermions (CF) near the Landau filling factor . We find evidence for effects due to randomization of semiclassical ballistic CF trajectories. These produce magnetoresistance features similar to those observed near zero magnetic field. However, we were not able to reproduce the recent CF magnetic focusing experiment despite using devices of very similar quality to those used in the original experiment. We also searched, without success, for phenomena due to phase coherence of CF. The relative ease with which the various magnetoresistance effects are seen in CF is discussed, in part with the aid of semiclassical simulations. It is discovered that inhomogeneities of carrier density cause the magnetoresistance anomalies to be smeared out, largely as a result of spatial variations in the effective magnetic field experienced by the CF. We find also that experiments which are based on randomization of trajectories are more resilient to this spatial variation.
Publication date
AffiliationNational Research Council Canada; NRC Institute for Microstructural Sciences
Peer reviewedNo
NPARC number12332903
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Record identifier74bf2cb1-840f-4ebe-bec9-472dd0cbf26d
Record created2009-09-10
Record modified2016-05-09
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