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Tunable Flat Band in Large‐Scale Kagome Lattice of Single Layer (BETS)2GaCl4

Authors: Abdou Hassanien

Phys. Status Solidi B2019, 1900346

Abstract: Kagome lattice is expected to be a perfect platform for hosting exotic emergentphenomena such as negative magnetism and unconventional superconductivity.However, the preparation of such a lattice on a scale of 100 nm or more, witha perfect crystalline order, especially in organic systems, is challenging. Herein,a facile method is presented to fabricate a large scale of epitaxial single-layerorganic Kagome lattice based on (BETS)2GaCl4on Ag(111) (where BETS isbis(ethylenedithio)tetraselenafulvalene). The lattice accommodates guestmolecules with size up to 1 nm, thus making it possible to host a variety of singlemolecular magnets. This possibility is demonstrated by the in situ selectiveencapsulation of GaCl4radicals in the pores. Scanning tunneling microscopy andspectroscopy reveal that both the radical states and the trimer units exhibit sharpand spatially localized peaks at 1.08 and 1.42 eV, respectively. The persistenceof these sharp features together with spatial localization, regardless of biasingconditions, suggests an evidence of a frustratedflat band with a possible tuningto incorporate topological order.


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