Evidence for a Bilayer Quantum Wigner Solid
  As the electronic charge distribution in a wide quantum well is tuned from a single-layer through an interacting bilayer configuration to weakly-coupled parallel layers, we observe an insulating phase concurrently manifesting a dramatic evolution. The data reveal that interlayer interactions, playing a crucial role, are able to stabilize a {\it correlated bilayer} electron insulator, thus providing tantalizing evidence of a pinned bilayer Wigner solid phase crystallizing at total filling factor $\nu$ as large as 0.54 ($\nu > \frac14$ in each layer). 
H. C. Manoharan, Y. W. Suen, M. B. Santos, and M. Shayegan (Princeton   University)