Ionic liquid gating on Al-flux grown SmB6 using Hall bar geometry

ORAL

Abstract

Samarium hexaboride (SmB6) is a correlated material in which strong f-d interactions lead to the opening of a small hybridization gap below 100 K at the Fermi energy. Below 4 K, the plateau in resistivity which was a long standing mystery in SmB6 has been proposed to arise from a crossover to surface conduction due to topological effects. We investigate how this plateau, as well as the corresponding plateau in the Hall coefficient, can be tuned by gating with the ionic liquid DEME-TFSI. Results are obtained on an Al-flux grown sample in Hall bar geometry prepared by finely polishing on all sides. The sample is suspended in the ionic liquid to ensure that all surfaces contributing to transport are gated. We find that resistivity can be changed by over 15% in the range of accessible voltages in the liquid, and that the Hall coefficient demonstrates a much larger effect of up to 33% change over the same range. We also present a model based on measured parameters of the 2D Fermi surface in SmB6 to explore these changes.

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Presenters

  • Alexa Rakoski

    Department of Physics, University of Michigan, University of Michigan, Physics, University of Michigan

Authors

  • Alexa Rakoski

    Department of Physics, University of Michigan, University of Michigan, Physics, University of Michigan

  • Dmitri Mihaliov

    Physics, University of Michigan, Department of Physics, University of Michigan

  • Cagliyan Kurdak

    Department of Physics, University of Michigan, University of Michigan, Physics, University of Michigan

  • Priscila Rosa

    Los Alamos National Laboratory, MPA-CMMS, Los Alamos National Laboratory, Los Alamos, USA, Condensed Matter and Magnet Sciences, Los Alamos National Laboratory

  • Zachary Fisk

    University of California - Irvine, Department of Physics and Astronomy, University of California Irvine, University of California, Irvine, UC Irvine, Department of Physics and Astronomy, University of California- Irvine, Department of Physics and Astronomy, University of California - Irvine, Physics and Astronomy, University of California, Irvine