Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 25: Focus Session: Atomic-Scale Characterization of Correlated Ground States in Epitaxial 2D Materials

Tuesday, September 6, 2022, 10:30–13:00, H2

The rapid expansion of the family of two-dimensional (2D) materials led to the observation of various quantum phases with correlated ground states in the 2D limit, such as unconventional superconductivity, charge density waves, and novel magnetic phases. On the fundamental level, there are various open questions regarding the mechanisms that underlie these correlated ground states, as well as the understanding of the role of the interface and dimensionality. The epitaxial growth of 2D materials on inert substrates under ultrahigh vacuum conditions and respective in situ investigation allows direct and unambiguous comparison between experimental findings and first-principles calculations. Experimentally, scanning tunneling microscopy methods are ideal to explore the electronic structure and magnetic properties of emerging 2D quantum phases with ultimate real-space and energy resolution at ultra-low temperatures. Theoretically, the use of density functional theory calculations requires atomically well-defined unit cells to precisely predict the electronic and magnetic properties. Combining these complementary approaches helps to elucidate the role of the substrate, defects, and the coupling between quasiparticles in stacked heterostructures.

Organizers: Nadine Hauptmann (Radboud University, Nijmegen), Jeison Fischer (University of Cologne), and Wouter Jolie (University of Cologne)

	10:30	O 25.1	Topical Talk: Designer electronic states in van der Waals heterostructures — •Peter Liljeroth
	11:00	O 25.2	Topical Talk: Magnetic order in a coherent Kondo lattice in the 1T/1H TaSe2 heterostructure — Wen Wan, Rishav Harsh, Paul Dreher, Sandra Sajan, Antonella Meninno, Ion Errea, Fernando de Juan, and •Miguel Ugeda
	11:30	O 25.3	Topological Surface State in epitaxial zz-GNRs — •M. Gruschwitz, T.T.N. Nguyen, N. de Vries, H. Karakachian, J. Aprojanz, A.A. Zakharov, C. Polley, T. Balasubramanian, U. Starke, C.F.J. Flipse, and C. Tegenkamp
	11:45	O 25.4	Topical Talk: Charge order in two-dimensional materials — •Erik van Loon
	12:15	O 25.5	Superconductivity of ultrathin crystalline Al films — •Werner M.J. van Weerdenburg, Anand Kamlapure, Niels P.E. van Mullekom, Xiaochun Huang, Manuel Steinbrecher, Peter Krogstrup, and Alexander A. Khajetoorians
	12:30	O 25.6	Realization of Pb honeycomb stuctures by intercalation of buffer layers on SiC(0001) — •Chitran Ghosal, Markus Gruschwitz, and Christoph Tegenkamp
	12:45	O 25.7	Sn intercalation of the buffer layer/SiC(0001) interface studied by SPA-LEED and STM — •Zamin Mamiyev, Chitran Ghosal, and Christoph Tegenkamp