Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session T00: Poster Session III (1pm-4pm PST)
1:00 PM,
Thursday, March 9, 2023
Room: Exhibit Hall (Forum Ballroom)
Sponsoring
Unit:
APS
Abstract: T00.00075 : Robust, gapped, flat bands at half-filling in the minimal model of the superconducting metal-organic framework, Cu-BHT
Presenter:
Henry L Nourse
(Okinawa Institute of Science & Technolog)
Authors:
Henry L Nourse
(Okinawa Institute of Science & Technolog)
Miriam F Ohlrich
(The University of Queensland)
Ben J Powell
(The University of Queensland)
Metal organic frameworks (MOFs) are materials whose underlying lattice is easily designed and tuned because of the unprecedented control over the metallic centers and the ligand linkers. They are often insulating, which is thought to be due to strong electronic correlations. It was recently reported that Cu-BHT has unconventional superconductivity and exhibits strong electronic correlations. Many MOFs, like Cu-BHT, form a kagome lattice of the metals which have large covalency with ligands lying along the bonds.
We introduce the tight-binding model of the kagome-Lieb lattice as a minimal model. We find five flat bands, with three partially filled at half-filling with a large energy gap to other bands. Including longer-ranged hopping beyond nearest-neighbor introduces a finite bandwidth to the three flat bands, but they remain flatter and more isolated than those in twisted bilayer graphene. Thus, framework materials are ideal for exploring flat band physics in bulk materials at higher electronic densities.
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