Regensburg 2025 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 5: 2D Materials Beyond Graphene: Growth, Structure and Substrate Interaction (joint session O/HL)
HL 5.3: Talk
Monday, March 17, 2025, 15:30–15:45, H11
Electronic structure and edge states in the 2D Kagome lattice Ta2S3 / Au(111) — •Thais Chagas1, Alessia Bardazzi1, Samuel M. Vasconcelos2, Alan C. R. Souza3, Catherine Grover1, Alice Bremerich1, Kai Mehlich1, Daniel Weber1, Mario S. C. Mazzoni3, Michael Rohlfing2, and Carsten Busse1 — 1Department Physik, Universität Siegen, Germany — 2Institute of Solid State Theory, Universität Münster, Germany — 3Departamento de Física, Universidade Federal de Minas Gerais, Brazil
Kagome structures are a key model system in quantum physics, representing one of the most geometrically frustrated 2D magnetic lattices. In these systems, magnetic moments condense into a spin liquid phase at low temperatures, leading to intriguing physical phenomena. The characteristic Kagome bands in this lattice consist of a Dirac cone that gives rise to massless Dirac fermions with high mobility and a flat band that, in contrast, leads to fermions with infinite effective mass.
In this work, we investigate the 2D Ta2S3 Kagome phase on Au(111) using scanning tunneling microscopy (STM). STM images reveal bright island edges as a consequence of an enhanced density of states, indicating the presence of edge states. Additionally, we observe a significant dependence of atomic contrast on tunneling conditions, suggesting a complex electronic band structure near the Fermi level. Furthermore, we analyze the impact of growth parameters on defect formation. Finally, density functional theory (DFT) was employed to study the electronic structure of this material on Au(111), providing deeper insight into its electronic properties and interactions.
Keywords: Kagome; TMDCs; 2D materials; STM