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Composite Fermions with a Warped Fermi Contour

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arxiv 1412.1447 v2 pith:IYXFXMLU submitted 2014-12-03 cond-mat.mes-hall

Composite Fermions with a Warped Fermi Contour

M. A. Mueed , D. Kamburov , Yang Liu , M. Shayegan , L. N. Pfeiffer , K. W. West , K. W. Baldwin , R. Winkler This is my paper
classification cond-mat.mes-hall
keywords compositecontourfermifermionslandaulevelwarpedband
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Via measurements of commensurability features near Landau filling factor $\nu=1/2$, we probe the shape of the Fermi contour for hole-flux composite fermions confined to a wide GaAs quantum well. The data reveal that the composite fermions are strongly influenced by the characteristics of the Landau level in which they are formed. In particular, their Fermi contour is $\textit{warped}$ when their Landau level originates from a hole band with significant warping.

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