Liquid Electrolyte Gating

New phase induced by electrolyte gating

The research in memristors and liquid electrolyte gating devices, where interfacial electric field induces modification throughout the film, requires spectroscopy investigation with large probe depth. HAXPES is the ideal technique to study these systems. We investigated the 3d orbital ordering of a VO2 thin film before and after been gated by ionic liquid electrolyte. The dependence of the photoemission intensity on the direction of the light electric field indicates a reduced orbital polarization in the gated state with respect to the monoclinic phase. A smaller orbital polarization is a direct consequence of the reduced vanadium dimerization, as shown schematically [1].

Figure 1: Valence band of VO2 for pristine rutile and monoclinic state, and gated state.
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