Changjiang Liu (University at Buffalo)

Date: Mon. January 24th, 2022, 12:45 pm-1:45 pm
Location: via Zoom (Meeting ID: 91377878431 Password: 577420)
Website: https://arts-sciences.buffalo.edu/physics/faculty/faculty-directory.host.html/content/shared/arts-sciences/physics/faculty-profiles-directories/new-profiles/liu-changjiang.html

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 T_c 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