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O: Fachverband Oberflächenphysik

O 64: Focus Session Atomic Scale Investigation of Magnetic 2D Materials

O 64.3: Hauptvortrag

Mittwoch, 19. März 2025, 16:00–16:30, H2

Tailoring spin lattice in van der Waals monolayer crystals — •Ying-Shuang Fu — Huazhong University of Science and Technology, Wuhan, Chinaina

Spin lattices in monolayer van der Waals (vdW) crystals provide a paradigm for exploring both fundamental spin physics at the 2D limit and miniaturized spintronic applications. Here, we present our recent research in the construction of spin lattices with molecular beam epitaxy and addressing their spin states with both spin-averaged and spin-polarized scanning tunneling microscopy. We explored artificial Kondo lattices in monolayer vdW crystals aiming to emulate protocol heavy fermion systems. We realized quasi-1D Kondo lattice in monolayer stripe-phase 1T-NbSe2 and superconducting 2D Kondo lattice in monolayer VSe2 grown on NbSe2. We also investigated intrinsic magnetic order in monolayer vdW crystals using spin-polarized scanning tunneling microscopy. We identified an antiferromagnetic order in monolayer CrTe2, unraveling the indispensable role of interlayer coupling in determining the magnetic order. Based on that finding, we further fabricated Janus CrTeSe monolayer, and regulates the magnetic anisotropy energy via the symmetry breaking introduced from the Janus structure. Our study resolves intrinsic magnetism with atomic-scale resolution down to monolayer limit, opening up an avenue for studying the unusual spin excitations.

Keywords: Kondo lattice; magnetic order; van der Waals; scanning tunneling microscopy; spin polarized