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Shubnikov-de Hass oscillations to the quantum limit in (111) oriented SrTiO<sub>3</sub> interface 2D electron gas

ORAL

Abstract

The (111) surface of perovskite oxide SrTiO3 has a hexagonal structure, similar to topological insulator Bi2Se3. Existence of topological states has been predicted in this system and high mobility two-dimensional (2D) electron gases at interfaces provide a promising platform to study these properties. We created a 2D electron gas at SrTiO3 (111) interfaces with high mobility over 15000 cm2V-1s-1 at low temperatures. Utilizing interface engineering, we have achieved relatively low carrier density of 1.3x1013 cm-2. Longitudinal magnetoresistance shows clear Shubnikov-de Hass (SdH) oscillations at low temperatures and high magnetic fields at both 35 T (DC field) and 60 T (pulsed field). In the low carrier density sample, we have observed the lowest Landau level at magnetic field around 20 T, which shifts to higher fields with higher carrier densities. More strikingly, a linear magnetoresistance (LMR) behavior appears at high magnetic field beyond the quantum limit. Temperature and angular dependence of the quantum oscillations as well as the LMR will be discussed.

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Presenters

  • Qi Li

    Pennsylvania State University, Department of Physics, Pennsylvania State University

Authors

  • Ziqiao Wang

    Pennsylvania State University, Department of Physics, Pennsylvania State University

  • Autumn B Heltman

    Pennsylvania State University

  • Shalini Kumari

    Pennsylvania State University

  • Qi Li

    Pennsylvania State University, Department of Physics, Pennsylvania State University

  • Shalinee Chikara

    CMS, National High Magnetic Field Laboratory, Florida State University

  • Alexey Suslov

    National High Magnetic Field Laboratory, Natl High Magnetic Field Lab, National High Magnetic Field Laboratory, Tallahassee FL, Florida State University

  • Fedor Balakirev

    Los Alamos National Laboratory, Los Alamos National Lab., Los Alamos Natl Lab

  • John Singleton

    National High Magnetic Field Lab, Los Alamos, Los Alamos National Laboratory, NHMFL, Los Alamos National Laboratory, National High Magnetic Field Laboratory, Los Alamos National Laboratory, NHMFL, Los Alamos National Lab, Los Alamos National Lab.