Dresden 2020 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 67: 2D Materials IV: Interfacial Interactions (joint session O/CPP/HL)

CPP 67.11: Talk

Wednesday, March 18, 2020, 13:00–13:15, WIL B321

Seeking 2D Ferromagnets among TMD materials — •Paul Dreher^1,2, Wen Wan^1,2, Adolfo O. Fumega⁵, Md N. Huda⁴, Shawulienu Kezilebieke⁴, Santiago Blanco^2,3, Victor Prado⁵, Hannu-Pekka Komsa⁴, Marco Gobbi^2,3, Peter Liljeroth⁴, and Miguel M. Ugeda^1,2 — ¹Donostia International Physics Center, San Sebastián, Spain — ²Centro de Física de Materiales, San Sebastián, Spain — ³CIC nanoGUNE, San Sebastián, Spain — ⁴Department of Applied Physics, Aalto University School of Science, 00076 Aalto, Finland — ⁵Departamento de Física Aplicada, Universidade de Santiago de Compostela, Campus Sur s/n, E-15782 Santiago de Compostela,Spain

We study the magnetic character of various monolayer TMD candidates (VSe2, CrSe2) grown by MBE on different substrates (NbSe2, graphene, graphite) by combining various characterization techniques. Our findings reveal that the substrate plays a crucial role on the magnetic order in the grown TMD monolayer. The CDW order in single-layer VSe2 causes a strong reduction in the DOS at EF incompatible with ferromagnetism. When grown on graphene substrates, the CDW persists VSe2 and it becomes paramagnetic [1]. Instead, the electronic structure of single-layer VSe2 on a superconducting substrate (NbSe2) shows features compatible with magnetism [2]. Finally, XMCD measurements on Cr-based TMD monolayers indicate the presence of an uncompensated spin in Cr, which retains a paramagnetic behavior even at low temperatures. [1] J.Phys.Chem.C, 123, 27802 (2019), [2] ArXiv:1909.10208 (2019).