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
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Junyi Yang
- Argonne National Laboratory
- University of Tennessee