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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2209.06837 |
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| _version_ | 1866910059608408064 |
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| author | Wagner, Glenn Das, Souvik Jung, Johannes Odobesko, Artem Küster, Felix Keller, Florian Korczak, Jedrzej Szczerbakow, Andrzej Story, Tomasz Parkin, Stuart Thomale, Ronny Neupert, Titus Bode, Matthias Sessi, Paolo |
| author_facet | Wagner, Glenn Das, Souvik Jung, Johannes Odobesko, Artem Küster, Felix Keller, Florian Korczak, Jedrzej Szczerbakow, Andrzej Story, Tomasz Parkin, Stuart Thomale, Ronny Neupert, Titus Bode, Matthias Sessi, Paolo |
| contents | 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 behaviour of such edge channels in Pb$_{1-x}$Sn$_{x}$Se 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2209_06837 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Interaction effects in a 1D flat band at a topological crystalline step edge Wagner, Glenn Das, Souvik Jung, Johannes Odobesko, Artem Küster, Felix Keller, Florian Korczak, Jedrzej Szczerbakow, Andrzej Story, Tomasz Parkin, Stuart Thomale, Ronny Neupert, Titus Bode, Matthias Sessi, Paolo Mesoscale and Nanoscale Physics Strongly Correlated Electrons 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 behaviour of such edge channels in Pb$_{1-x}$Sn$_{x}$Se 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. |
| title | Interaction effects in a 1D flat band at a topological crystalline step edge |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2209.06837 |