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TT: Fachverband Tiefe Temperaturen

TT 47: Poster Session Correlated Electrons 2

TT 47.10: Poster

Mittwoch, 18. März 2020, 15:00–19:00, P2/3OG

Theoretical study of designer Hubbard models — •David Mikhail and Stephan Rachel — School of Physics, University of Melbourne, Parkville, VIC 3010, Australia

There has been tremendous progress towards engineering of tuneable two-dimensional Hubbard models in Si:P systems using scanning tunnelling microscopy (STM). STM placement allows for localization of dopants with atomic-scale precision. Motivated by these recent experimental developments, we theoretically study low-dimensional phosphorus lattices in the framework of the Hubbard model. We numerically calculate local properties of the dopants like the local density of states as well as local correlations of spin and charge. These features are experimentally accessible through scanning tunnelling spectroscopy measurements. Additionally, we investigate electronic transport properties which can be measured in standard experiments. Atomically engineered nanostructures represent promising candidates for quantum many-body simulators of strongly correlated fermionic systems, which are known to exhibit exotic physics such as high-Tc superconductivity and topological phases. The discussed Si:P systems constitute a competitive alternative to cold atoms in optical lattices as for the former much lower temperature scales can be reached.