Observation of gapped Dirac cones in a two-dimensional Su-Schrieffer-Heeger lattice

Daiyu Geng, Hui Zhou, Shaosheng Yue, Zhenyu Sun, Peng Cheng, Lan Chen, Sheng Meng (), Kehui Wu () and Baojie Feng ()
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Daiyu Geng: Chinese Academy of Sciences
Hui Zhou: Chinese Academy of Sciences
Shaosheng Yue: Chinese Academy of Sciences
Zhenyu Sun: Chinese Academy of Sciences
Peng Cheng: Chinese Academy of Sciences
Lan Chen: Chinese Academy of Sciences
Sheng Meng: Chinese Academy of Sciences
Kehui Wu: Chinese Academy of Sciences
Baojie Feng: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-6

Abstract: Abstract The Su-Schrieffer-Heeger (SSH) model in a two-dimensional rectangular lattice features gapless or gapped Dirac cones with topological edge states along specific peripheries. While such a simple model has been recently realized in photonic/acoustic lattices and electric circuits, its material realization in condensed matter systems is still lacking. Here, we study the atomic and electronic structure of a rectangular Si lattice on Ag(001) by angle-resolved photoemission spectroscopy and theoretical calculations. We demonstrate that the Si lattice hosts gapped Dirac cones at the Brillouin zone corners. Our tight-binding analysis reveals that the Dirac bands can be described by a 2D SSH model with anisotropic polarizations. The gap of the Dirac cone is driven by alternative hopping amplitudes in one direction and staggered potential energies in the other one and hosts topological edge states. Our results establish an ideal platform to explore the rich physical properties of the 2D SSH model.

Date: 2022
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DOI: 10.1038/s41467-022-34043-9

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