Figure 1: Wide quantum well overview.
From: Microwave spectroscopy of the low-filling-factor bilayer electron solid in a wide quantum well
(a) Phase diagram in the γ–ν plane, where ν is the Landau filling and γ is the Coulomb energy (e2/4πε0εℓB) divided by the interlayer tunnelling gap. The insulating area is shaded grey, and the ranges of the FQHE states at ν=1/2 and ν=1/3 are shaded blue. Horizontal dashed lines mark ν=1/2, 2/5 and 1/3. (b–d) Different possible structures for bilayer Wigner solids as layer separation, d, increases for fixed n. A 1C triangular (tri.) structure (b), proceeds to a 2C staggered square (sqr.) structure (c) and then to a 2C staggered triangular (tri.) structure (d).
