Spectroscopic evidence of flat bands in breathing kagome semiconductor Nb3I8

Abstract

Kagome materials have become solid grounds to study the interplay among geometry, topology, correlation, and magnetism. Recently, semiconductors Nb3X8(X = Cl, Br, I) have been predicted to be two-dimensional (2D) magnets and importantly these materials possess breathing kagome geometry. Electronic structure study of these promising materials is still lacking. Here, we report the spectroscopic evidence of at and weakly dispersing bands in breathing-kagome semiconductor Nb3I8 around 500 meV binding energy, which is well supported by our first-principles calculations. These bands originate from the breathing kagome lattice of Niobium atoms and have Nb d character. They are found to be sensitive to polarization of the incident photon beam. Our study provides insight into the electronic structure and at band topology in an exfoliable kagome semiconductor thereby providing an important platform to understand the interaction of geometry and electron correlations in 2D material.

arXiv comment7 pages, 4 figures; supplementary information included

References in corpus (29)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Angle-resolved photoemission spectroscopy of the cuprate superconductors
• Optimized norm-conserving Vanderbilt pseudopotentials
• High temperature fractional quantum Hall states
• Fractionalized excitations in the spin liquid state of a kagomé lattice antiferromagnet
• CsV${}_3$Sb${}_5$: a ${\mathbb{Z}}_2$ topological kagome metal with a superconducting ground state
• Massive Dirac fermions in a ferromagnetic kagome metal
• Higher-order topological insulators and semimetals on the breathing Kagome and pyrochlore lattices
• Dirac fermions and flat bands in the ideal kagome metal FeSn
• Discovery of a quantum limit Chern magnet TbMn6Sn6
• Probing the Low-Energy Electronic Structure of Complex Systems by ARPES
• Negative flat band magnetism in a spin-orbit coupled correlated kagome magnet
• Topological flat bands in frustrated kagome lattice CoSn
• Giant and anisotropic many-body spin-orbit tunability in a strongly correlated kagome magnet
• Angle-resolved photoemission spectroscopy and its application to topological materials
• Intrinsic Quantum Anomalous Hall Effect in the Kagome Lattice Cs2LiMn3F12
• Theoretical prediction of a strongly correlated Dirac metal
• Novel magnetic states and nematic spin chirality in the kagome lattice metal YMn${}_6$Sn${}_6$
• Orbital-selective Dirac fermions and extremely flat bands in frustrated kagome-lattice metal CoSn
• Observation of topological flat bands in the kagome semiconductor Nb${}_3$Cl${}_8$
• Topological states on the breathing kagome lattice
• Giant anomalous Hall resistivity of the room temperature ferromagnet Fe3Sn2 - a frustrated metal with the kagome-bilayer structure
• Realizing Kagome Band Structure in Two-Dimensional Kagome Surface States of $R{V}_{6}S{n}_6$ ($R$=Gd,Ho)
• Dirac Fermions in Antiferromagnetic FeSn Kagome Lattices with Combined Space Inversion and Time Reversal Symmetry
• Anisotropically large anomalous and topological Hall effect in a kagome magnet
• Three-dimensional electronic structure in ferromagnetic ${\text{Fe}}_3{\text{Sn}}_2$ with breathing kagome bilayers
• Anomalous thickness-dependent electrical conductivity in van der Waals layered transition metal halide, Nb_3Cl_8
• Unusual magnetic and transport properties in HoMn${}_6$Sn${}_6$ kagome magnet
• Tunable electronic and magnetic properties of thin Nb${}_3$I${}_8$ nanofilms: interplay between strain and thickness

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• From strong to weak correlations in breathing-mode kagome van der Waals materials: Nb${}_3$(F,Cl,Br,I)${}_8$ as a robust and versatile platform for many-body engineering
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• Spin-polarized triplet excitonic insulators in Ta3X8 (X=I, Br) monolayers