Surface acoustic waves studies on STO and KTO based heterostructures

ORAL

Abstract

LAO/STO attracts interest due to its properties like gate tuneable 2DEG, ferroelectricity, ferroelasticity , superconductivity, etc. KTO, despite being structurally similar to STO, does not show a bulk ferroelastic transition.The superconducting Tc of KTO is dependent on its crystal orientation with Tc ~ 2K along [111] and 50mK along [001]. We use surface acoustic waves (SAW) to probe possible structural phase transitions in these heterostructures. SAW are generated using interdigitated transducers and are sensitive to surface phonon modes. We also discuss the possibility of integrating SAWs with nanostructures to coherently shuttle electrons or electron pairs.

* JL and PI acknowledge support from the National Science Foundation (DMR-2225888). JL, PI, C-BE, and BH acknowledge support from the US Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences (BES), under award number under grant DOE QIS (DE-SC0022277). C.B.E acknowledges funding by the Gordon and Betty Moore Foundation’s EPiQS Initiative (grant GBMF9065) and a Vannevar Bush Faculty Fellowship (ONR N00014-20-1-2844). The work at the University of Wisconsin–Madison was supported by the US Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences (BES), under award number DE-FG02-06ER46327.

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Presenters

  • Ranjani Ramachandran

    University of Pittsburgh

Authors

  • Ranjani Ramachandran

    University of Pittsburgh

  • Dengyu Yang

    Carnegie Mellon University

  • Muqing Yu

    University of Pittsburgh

  • Jieun Kim

    University of Wisconsin - Madison

  • Chang-Beom Eom

    University of Wisconsin-Madison, Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA, University of wisconsin-madison, Department of Materials Science and Engineering, University of Wisconsin-Madison, Wisconsin 53706, USA

  • Patrick Irvin

    University of Pittsburgh, Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA

  • Jeremy Levy

    University of Pittsburgh, Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA