Würzburg ToCoTronics Colloquium

Advances in low-temperature scanning tunnelling microscopy and atomic-scale manipulation enabled the atom-by-atom creation and characterization of quantum states of matter [1]. In recent years, various artificial lattices have been created to emulate the band structure of Dirac, topological, and strongly correlated materials [2-4]. Nevertheless, previous studies mostly relied on using bulk metallic substrates, where the delocalized electrons strongly interact with the patterned atomic lattice, leading to unwanted screening and hybridization effects. In this talk, I will show a new strategy, emulating complex artificial molecular orbitals, based on positioning individual cesium atoms on the surface of semiconducting indium antimonide [5]. This work provides a superior platform for in-depth exploration of the topological phase and many-body physics in the designed lattices.

References:

[1] Khajetoorians, A. A. et al. Nat. Rev. Phys. 1, 703–715 (2019).

[2] Gomes, K. K. et al., Nature 483, 306–310 (2012).

[3] Slot, M. R. et al., Nature Physics 13, 672-676 (2017).

[4] S. N. Kempkes, et al., Nat. Mater. 18, 1292 (2019).

[5] E. Sierda,  et al., arXiv:2210.06754.

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