Particular highlights have included:
- Gating SrTiO3 into metallicity and then superconductivity.
- Gating ZnO into metallicity.
- Gating ferromagnetic response in GaMnAs and Co-doped TiO2.
- Gate-induced superconductivity in KTaO3.
The results just keep coming. There are some real subtleties to the technique, though. It's extremely important to make sure that the ionic liquid is really acting as a chemically inert electrolyte, and not inducing electrochemistry at the material surface or any other kind of chemical doping.
Anyway, this whole area is clearly one to watch in condensed matter. Anytime you can push into a previously inaccessible regime, Nature tends to offer up surprises.