%0 Journal Article %1 wagner2023interaction %A Wagner, Glenn %A Das, Souvik %A Jung, Johannes %A Odobesko, Artem %A Küster, Felix %A Keller, Florian %A Korczak, Jedrzej %A Szczerbakow, Andrzej %A Story, Tomasz %A Parkin, Stuart S. P. %A Thomale, Ronny %A Neupert, Titus %A Bode, Matthias %A Sessi, Paolo %B Nano Letters %D 2023 %I American Chemical Society %J Nano Lett. %K a %N 7 %P 2476--2482 %R 10.1021/acs.nanolett.2c03794 %T Interaction effects in a 1D flat band at a topological crystalline step edge %U https://doi.org/10.1021/acs.nanolett.2c03794 %V 23 %X Step edges of topological crystalline insulators can be viewed as predecessors of higher-order topology, as they embody one-dimensional edge channels embedded in an effective three-dimensional electronic vacuum emanating from the topological crystalline insulator. Using scanning tunneling microscopy and spectroscopy, we investigate the behavior of such edge channels in Pb1–xSnxSe under doping. Once the energy position of the step edge is brought close to the Fermi level, we observe the opening of a correlation gap. The experimental results are rationalized in terms of interaction effects which are enhanced since the electronic density is collapsed to a one-dimensional channel. This constitutes a unique system to study how topology and many-body electronic effects intertwine, which we model theoretically through a Hartree–Fock analysis.

@article{wagner2023interaction, abstract = {Step edges of topological crystalline insulators can be viewed as predecessors of higher-order topology, as they embody one-dimensional edge channels embedded in an effective three-dimensional electronic vacuum emanating from the topological crystalline insulator. Using scanning tunneling microscopy and spectroscopy, we investigate the behavior of such edge channels in Pb1–xSnxSe under doping. Once the energy position of the step edge is brought close to the Fermi level, we observe the opening of a correlation gap. The experimental results are rationalized in terms of interaction effects which are enhanced since the electronic density is collapsed to a one-dimensional channel. This constitutes a unique system to study how topology and many-body electronic effects intertwine, which we model theoretically through a Hartree–Fock analysis.}, added-at = {2023-07-03T12:07:13.000+0200}, author = {Wagner, Glenn and Das, Souvik and Jung, Johannes and Odobesko, Artem and Küster, Felix and Keller, Florian and Korczak, Jedrzej and Szczerbakow, Andrzej and Story, Tomasz and Parkin, Stuart S. P. and Thomale, Ronny and Neupert, Titus and Bode, Matthias and Sessi, Paolo}, biburl = {https://www.bibsonomy.org/bibtex/2cbfcbb64cc34cbbd9e4de54b7ff755ee/ctqmat}, booktitle = {Nano Letters}, comment = {doi: 10.1021/acs.nanolett.2c03794}, day = 27, doi = {10.1021/acs.nanolett.2c03794}, interhash = {39c293d88bb7ddb97f7ebe74b4e31a45}, intrahash = {cbfcbb64cc34cbbd9e4de54b7ff755ee}, issn = {15306984}, journal = {Nano Lett.}, keywords = {a}, month = {05}, number = 7, pages = {2476--2482}, publisher = {American Chemical Society}, timestamp = {2023-10-13T11:18:25.000+0200}, title = {Interaction effects in a 1D flat band at a topological crystalline step edge}, url = {https://doi.org/10.1021/acs.nanolett.2c03794}, volume = 23, year = 2023 }