Valley-tunable, even-denominator fractional quantum Hall state in the lowest Landau level of an anisotropic system

Fractional quantum Hall states (FQHSs) at even-denominator Landau level filling factors (\nu) are of prime interest as they are predicted to host exotic, topological states of matter. We report here the observation of a FQHS at \nu=1/2 in a two-dimensional electron system of exceptionally high quality, confined to a wide... Show more