Hidden anisotropy for electrons at a 2D oxide interface
ORAL
Abstract
The recent discovery of 2D superconductivity at interfaces of the strongly spin-orbit coupled cubic perovskite KTaO3 (KTO) offers a new playground for exploring emergent quantum phenomenon. Here we report on observation of anisotropic transport properties within KTO (110) two-dimensional electron gases (2DEG). When the KTO (110) 2DEG is realized using non-magnetic overlayers, we observe anisotropy similar to that found in 2DEGs at SrTiO3 (110) interfaces. However, when the KTO (110) 2DEG is realized using a magnetic overlayer, we find anisotropic behavior that is consistent with an anisotropic spin susceptibility, which suggests a peculiar spin texture at the Fermi surface. In particular, the critical fields for 2D superconductivity in heterostructures with magnetic overlayer along different crystal axis shows a competition between orbital and spin susceptibilities. In addition, we observed an anisotropic enhancement of quantum interference of the 2D electrons within the heterostructure with magnetic overlayer at low temperature.
*Funding acknowledgement: Research was supported by DOE BES, Materials Science and Engineering Division. Partial financial support was provided by the College of Arts and Sciences, University at Buffalo, SUNY.
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Presenters
Junyi Yang
Argonne National Laboratory, University of Tennessee
Authors
Junyi Yang
Argonne National Laboratory, University of Tennessee
Changjiang Liu
University at Buffalo
Qianheng Du
Argonne National Laboratory
John Pearson
Argonne National Lab, Argonne National Laboratory
Alexey Suslov
National High Magnetic Field Laboratory, National High Magnetic Field Laboratory, Florida State University
