Ionic-liquid-gating study of SrTiO3 and KTaO3

ORAL

Abstract

Strontium titanate (SrTiO3, STO) and potassium tantalate (KTaO3, KTO) are insulators, quantum paraelectrics, and they both have the cubic perovskite structure at room temperature [1,2]. The charge-carrier density in these materials is usually modified via substitutional- or oxygen-vacancy doping. An alternative approach is ionic-liquid gating, which involves the use of an electric field to modify the carrier density in a material; an electric double layer forms between the sample and the ionic liquid when a gate voltage is applied between them [3]. Here we report on a systematic investigation of the gating-induced insulator-metal transition and temperature-dependent resistivity of STO and KTO.

[1] C. Collignon et al., Annual Review of Condensed Matter Physics 10, 25 (2019)

[2] K. Ueno et al., Nat. Nanotechnol. 6, 408 (2011)

[3] C. Leighton, Nat. Mater. 18, 13 (2019)

This work was supported by the National Science Foundation through the University of Minnesota MRSEC under Award Number DMR-2011401.

–

Presenters

  • Chiou Yang Tan

    School of Physics and Astronomy, University of Minnesota

Authors

  • Chiou Yang Tan

    School of Physics and Astronomy, University of Minnesota

  • Issam Khayr

    School of Physics and Astronomy, University of Minnesota, University of Minnesota

  • Tathamay Basu

    School of Physics and Astronomy, University of Minnesota

  • Sajna Hameed

    University of Minnesota, School of Physics and Astronomy, University of Minnesota

  • Damjan Pelc

    University of Zagreb, Physics Department, University of Zagreb

  • Martin Greven

    University of Minnesota, School of Physics and Astronomy, University of Minnesota