Coupled straintronic-optoelectronic effect in Mott oxide films

Nanoscale. 2022 Apr 7;14(14):5545-5550. doi: 10.1039/d2nr01099b.

Abstract

Controlling the electronic properties of complex oxides by an external stimulus is of significant importance for exploring exotic quantum states and developing modern electronic devices with low-level energy consumption. Here, we demonstrate the electro-photo double control of electronic transport for Mott insulating LaVO3 thin films deposited onto ferroelectric 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 substrates. An electrically driven linear electroresistance effect is acquired at room temperature through the converse piezoelectric response, which can be optically regulated by 79%. Furthermore, the visible light-activated photoresistance response can be efficiently tuned by piezo strain. These results demonstrate that the strain-excited effect and photo-generated effect strongly correlated with each other, mediated by lattice-charge-orbital coupling. Our work points to an effective strategy for realizing the coupled straintronic-optoelectronic effect in hybrid correlated oxide/ferroelectric systems and delivering multi-field tunable low-dissipation versatile electronic and photonic devices.