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The fractional quantum Hall effect (FQHE) states at half integer Landaufillings ($\nu$) have long been of great interest, since they have correlationsthat differ from those of the fundamental Laughlin states found at odddenominators. At $\nu=1/2$ the FQHE has been observed in wide or double quantumwells, and is ascribed to the two-component Halperin-Laughlin $\Psi_{331}$state. $\Psi_{331}$ excitations carry charge $\pm e/4$, like the carriers of$\nu=5/2$ states which are of interest in quantum computation. Further, such anexcitation (quasiparticle or -hole) of $\Psi_{331}$ has unequal, oppositecharge in the top and bottom layers, and hence an up or down dipole moment.Here we report evidence for a Wigner solid (WS) of such dipolar quasiholes froma quantitative study of the microwave spectra of a wide quantum well (WQW) at$\nu$ close to 1/2.

Microwave spectroscopic observation of a Wigner solid within the 1/2 fractional quantum Hall effect