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Shayegan","submitted_at":"2017-04-22T14:14:09Z","abstract_excerpt":"The pairing of composite fermions (CFs), electron-flux quasi-particles, is commonly proposed to explain the even-denominator fractional quantum Hall state observed at $\\nu=5/2$ in the first excited ($N=1$) Landau level (LL) of a two-dimensional electron system (2DES). While well-established to exist in the lowest ($N=0$) LL, much is unknown about CFs in the $N=1$ LL. Here we carry out geometric resonance measurements to detect CFs at $\\nu=5/2$ by subjecting the 2DES to a one-dimensional density modulation. 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