Electric-field control of zero-dimensional topological states in ultranarrow germanene nanoribbons
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912658794479616 |
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| author | Eek, Lumen Westende, Esra D. van 't Klaassen, Dennis J. Zandvliet, Harold J. W. Bampoulis, Pantelis Smith, Cristiane Morais |
| author_facet | Eek, Lumen Westende, Esra D. van 't Klaassen, Dennis J. Zandvliet, Harold J. W. Bampoulis, Pantelis Smith, Cristiane Morais |
| contents | Reversible, all-electric control of symmetry-protected zero-dimensional modes has been a long-standing goal. In buckled honeycomb lattices, a perpendicular field couples to the staggered sublattice potential providing the required handle. We combine scanning tunneling microscopy and tight-binding theory to switch zero-dimensional topological end states reversibly on and off in ultranarrow germanene nanoribbons by tuning the electric field in the tunnel junction. Increasing the field switches off the end modes of topological two-hexagon wide ribbons, while the same field switches on zero-dimensional states in initially trivial three- and four-hexagon wide ribbons. This atomic scale platform realizes a proof-of-principle for a zero-dimensional topological field effect device, opening a path for ultrasmall memory, controllable qubits, and neuromorphic architectures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_16158 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Electric-field control of zero-dimensional topological states in ultranarrow germanene nanoribbons Eek, Lumen Westende, Esra D. van 't Klaassen, Dennis J. Zandvliet, Harold J. W. Bampoulis, Pantelis Smith, Cristiane Morais Materials Science Mesoscale and Nanoscale Physics Reversible, all-electric control of symmetry-protected zero-dimensional modes has been a long-standing goal. In buckled honeycomb lattices, a perpendicular field couples to the staggered sublattice potential providing the required handle. We combine scanning tunneling microscopy and tight-binding theory to switch zero-dimensional topological end states reversibly on and off in ultranarrow germanene nanoribbons by tuning the electric field in the tunnel junction. Increasing the field switches off the end modes of topological two-hexagon wide ribbons, while the same field switches on zero-dimensional states in initially trivial three- and four-hexagon wide ribbons. This atomic scale platform realizes a proof-of-principle for a zero-dimensional topological field effect device, opening a path for ultrasmall memory, controllable qubits, and neuromorphic architectures. |
| title | Electric-field control of zero-dimensional topological states in ultranarrow germanene nanoribbons |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2506.16158 |