Decorated electronic kagome lattice in twisted bilayer germanene
Abstract
Artificial kagome lattices provide a route to electronic flat bands, geometric frustration, and correlation driven phases, but their realization in atomically controlled two-dimensional materials remains scarce. Here, we show that commensurate twisted bilayer germanene on Ge2Pt produces two electronically distinct large-angle moiré phases. Scanning tunneling microscopy measurements and density functional theory calculations reveal that commensurate twisted bilayers that are odd under an exchange of sublattices are semiconducting, whereas the twisted bilayers with an even parity are metallic. The twisted bilayers with an even parity host an empty state resonance that exhibits an emergent decorated kagome structure with a C3 symmetry. These results establish large-angle twisted germanene as a platform for engineering kagome-like electronic states in a buckled two-dimensional material.
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BibTeX
@misc{klaassen2026decorated,
title = {{Decorated electronic kagome lattice in twisted bilayer germanene}},
author = {Dennis J. Klaassen and Rian A. M. Ligthart and Andrés R. Botello Mendez and Lumen Eek and Esra van 't Westende and Paul L. de Boeij and Y. Wang and D. Vanmaekelbergh and Pantelis Bampoulis and Cristiane Morais Smith and Ingmar Swart and Zeila Zanolli and Harold J. W. Zandvliet},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.08750},
eprint = {2609.08750},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.08750},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Decorated electronic kagome lattice in twisted bilayer germanene
AU - Dennis J. Klaassen
AU - Rian A. M. Ligthart
AU - Andrés R. Botello Mendez
AU - Lumen Eek
AU - Esra van 't Westende
AU - Paul L. de Boeij
AU - Y. Wang
AU - D. Vanmaekelbergh
AU - Pantelis Bampoulis
AU - Cristiane Morais Smith
AU - Ingmar Swart
AU - Zeila Zanolli
AU - Harold J. W. Zandvliet
PY - 2026
DA - 2026/09/08
PB - arXiv
DO - 10.48550/arxiv.2609.08750
UR - https://arxiv.org/abs/2609.08750
AB - Artificial kagome lattices provide a route to electronic flat bands, geometric frustration, and correlation driven phases, but their realization in atomically controlled two-dimensional materials remains scarce. Here, we show that commensurate twisted bilayer germanene on Ge2Pt produces two electronically distinct large-angle moiré phases. Scanning tunneling microscopy measurements and density functional theory calculations reveal that commensurate twisted bilayers that are odd under an exchange of sublattices are semiconducting, whereas the twisted bilayers with an even parity are metallic. The twisted bilayers with an even parity host an empty state resonance that exhibits an emergent decorated kagome structure with a C3 symmetry. These results establish large-angle twisted germanene as a platform for engineering kagome-like electronic states in a buckled two-dimensional material.
ER -