Realization of a Two-Dimensional Lieb Lattice in a Metal-Inorganic Framework with Flat Bands and Topological Edge States
arxiv(2024)
摘要
Flat bands and Dirac cones in materials are at the source of the exotic
electronic and topological properties. The Lieb lattice is expected to host
these electronic structures, arising from quantum destructive interference.
Nevertheless, the experimental realization of a two-dimensional Lieb lattice
remained challenging to date due to its intrinsic structural instability. After
computationally designing a Platinum-Phosphorus (Pt-P) Lieb lattice, we have
successfully overcome its structural instability and synthesized it on a gold
substrate via molecular beam epitaxy. Low-temperature scanning tunneling
microscopy and spectroscopy verified the Lieb lattice's morphology and
electronic flat bands. Furthermore, topological Dirac edge states stemming from
pronounced spin-orbit coupling induced by heavy Pt atoms have been predicted.
These findings convincingly open perspectives for creating metal-inorganic
framework-based atomic lattices, offering prospects for strongly correlated
phases interplayed with topology.
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