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Changjiang Liu (University at Buffalo)

Date: Mon. January 24th, 2022, 12:45 pm-1:45 pm
Location: via Zoom (Meeting ID: 91377878431 Password: 577420)

Superconductivity at the oxide-insulator/KTaO3 interface and electric-field control of magnon spin current in Cr2O3

Changjiang Liu, Department of Physics, University of Buffalo

Youtube video

Abstract. — Oxide material system is an ideal playground for uncovering new physical phenomena owing to the strong interactions between electron spins, charges, and lattices. In this talk, I will first present the recent discovery of two-dimensional superconductivity at the oxide-insulator/KTaO3 (111) interfaces. The superconducting transition temperature Tc reaches 2.2 K, which is about one order of magnitude higher than that found in the widely studied LaAlO3/SrTiO3 system. Notably, this new interfacial superconductor shows some unusual properties, including crystallographic orientation dependent superconductivity and an in-plane transport anisotropy. If time permits, I will then discuss how thermally excited magnons can be used to probe individual magnetic sublattices in the antiferromagnetic insulator Cr2O3. I will also show that the magnon spin current can be further controlled by an electric field via the magnetoelectric coupling in this classical antiferromagnet.

Host: Shulei Zhang

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