Figure 1
APS/Alan Stonebraker

Figure 1: (a) Lattice structure of the STO-LAO interface, showing the unpoled SrO and TiO2 planes in STO as well as the LaO+ and AlO2- planes with alternating polarity in LAO. (b) Simulation of the LAO overlayer by an electrolytic gel with frozen-in polarization, allowing for controlled tuning of the charge-carrier density in the two-dimensional electron gas. The diagrams to the right of (a) and (b) show the potential energy of the LAO overlayer and of the polarized gel, respectively, increasing linearly with layer thickness.