Two-Dimensional Band Structure in Honeycomb Metal–Organic Frameworks

Kumar, Avijit; Banerjee, K.; Foster, Adam S.; Liljeroth, Peter

doi:10.1021/acs.nanolett.8b02062

Cited by 78 publications

(101 citation statements)

References 73 publications

(171 reference statements)

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“…The close‐packed DCA molecules are stabilized by multiple C−H…N hydrogen bonds. An image taken at the LUMO resonance of the DCA molecules is shown in Figure e: the orbital has a lobe at the each end of the long axis of the anthracene backbone which is consistent with earlier reports . The porous structure, as further illustrated with the overlaid molecular and atomic schematics in Figure f, can be understood as a mixed phase of three‐fold Au‐coordinated DCA together with hydrogen bonded DCA supramolecular structures.…”

Section: Figuresupporting

confidence: 87%

“…The unit cell is shown as a white parallelogram in Figure d, where a 1 =1.04±0.03 nm, a 2 =0.87±0.05 nm and the angle between them is 50°±0.5°. Similar structure has been found in close‐packed DCA molecules on graphene/Ir(111) substrate, while it is in sharp contrast with the square lattice reported on Cu(111) surface, indicating that the DCA molecule‐Au(111) substrate interaction is relatively weak. The close‐packed DCA molecules are stabilized by multiple C−H…N hydrogen bonds.…”

Section: Figuresupporting

confidence: 74%

“…The d I /d V signal is proportional to the local density of states (LDOS) of the sample and allows us to probe the energetic positions of the electronic states in the network as well as their spatial extent . As shown in Figure a, d I /d V spectrum recorded on a DCA molecule in the close‐packed phase shows a broad, asymmetric resonance at 1.6 V corresponding to the LUMO . The asymmetric lineshape is caused by phonon replicas: the tunneling electrons can excite molecular vibrations at biases above the elastic peak.…”

Section: Figurementioning

confidence: 99%

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On‐Surface Assembly of Au‐Dicyanoanthracene Coordination Structures on Au(111)

et al. 2019

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On-surface metal-organic coordination provides a promising way for synthesizing different two-dimensional lattice structures that have been predicted to possess exotic electronic properties. Using scanning tunneling microscopy (STM) and spectroscopy (STS), we studied the supramolecular self-assembly of 9,10-dicyanoanthracene (DCA) molecules on the Au(111) surface. Close-packed islands of DCA molecules and Au-DCA metal-organic coordination structures coexist on the Au(111) surface. Ordered DCA 3 Au 2 metal-organic networks have a structure combining a honeycomb lattice of Au atoms with a kagome lattice of DCA molecules. Low-temperature STS experiments demonstrate the presence of a delocalized electronic state containing contributions from both the gold atom states and the lowest unoccupied molecular orbital of the DCA molecules. These findings are important for the future search of topological phases in metal-organic networks combining honeycomb and kagome lattices with strong spin-orbit coupling in heavy metal atoms.It is well-known that the exciting electronic properties of graphene are intimately linked to its honeycomb lattice with a two-atom unit cell. [1] This results in the formation of Dirac cones in the band structure and the linear dispersion around the K points (at the corners of the Brillouin zone). This is a generic property of any honeycomb lattice and has sparked interest in "artificial graphene": engineered systems that have the same structure. [2][3][4][5][6] There are other lattice geometries that have the potential to host exotic electronic phases. For example, the kagome lattice has the same Dirac band structure as the honeycomb lattice, but with an additional flat band [7] pinned to the top (or bottom) of the Dirac band. Furthermore, these systems can be driven into topological phases by adding spinorbit coupling. This opens gaps at the band crossings (the Dirac points) which host topological states in finite structures. [8][9][10] Metal-organic structures have been synthesized on surfaces following the concepts of supramolecular coordination chemistry. [11,12] Their architectures depend on the chemistry of the metal centres with organic linkers and on their interactions with the surface. [13] Over the past two decades, metal-organic networks with various lattice structures have been fabricated using different combinations of metal atoms and organic molecules. In addition to fabricating e. g. simple square geometry, metal-organic networks with honeycomb and kagome lattices have been formed. [14] These hold promise for hosting exotic band structures, especially when combined with heavy metal atoms. In fact, there are several recent predictions based on ab initio modelling suggesting that honeycomb and kagome metal-organic networks could host exotic quantum phases, for example, topological insulators. [15][16][17][18][19] However, most of the metal-organic networks that have been obtained are using 3d transition metals, with only a few reports on heavy metals which can provide strong spin-orbit ...

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Section: Figuresupporting

confidence: 87%

Section: Figuresupporting

confidence: 74%

Section: Figurementioning

confidence: 99%

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On‐Surface Assembly of Au‐Dicyanoanthracene Coordination Structures on Au(111)

et al. 2019

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“…A large amount of two-dimensional (2D) organic materials with diverse physical and chemical properties have been synthesized and studied in the past decades, by linking up well-designed organic precursors via covalent or coordination bond. [1][2][3][4][5][6][7][8][9] Metalorganic frameworks (MOFs), known as nanoporous coordination polymers, have drawn tremendous attention due to their tunable porous structures and site-isolation of catalytic units. This makes MOFs widely applied in fields such as sensors, [5,[10][11][12] supercapacitors, [4,[13][14][15] and catalysis.…”

mentioning

confidence: 99%

Tunable Thiolate Coordination Networks on Metal Surfaces

et al. 2020

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Thiolate coordination networks (TCNs) were synthesized on metal surfaces using benzenehexathiol (BHT) and analyzed by cryogenic scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS) as well as density functional theory. Upon adsorption, the deprotonation of the thiol groups occurred on the metal surface with the formation of metal-sulfur coordination bonds. Increasing the surface temperature triggered the complete dehydrogenation of BHT and promoted the formation of TCNs. On Ag(111), the TCN of [Ag 3 (C 6 S 6)] n was achieved and showed good thermal stability. On Cu(111), two TCNs ([Cu 6 (C 6 S 6)] n and [Cu 8 (C 6 S 6)] n ,) were identified. Interestingly, the construction of the two TCNs on Cu(111) can be precisely controlled by adjusting the temperature of the surface during deposition and thermal annealing. Our results reveal the significant influence of the metal surface on the formation of coordination networks.

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“…By replacing the metal atoms in organic QSH materials, the QSH gap can be tuned and quantum anomalous Hall effect may be induced . Synthesizing of such metal–organic materials have been reported but evidence of the existence of QSH states is yet to be obtained.…”

Section: Quantum Spin Hall Effect In Layered Materials and Thin Filmsmentioning

confidence: 99%

Quantum Spin Hall Materials

Cao

Chen

2019

Adv Quantum Tech

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The quantum spin Hall (QSH) effect describes the state of matter in certain 2D electron systems, in which an insulating bulk state arises together with helical states at the edge of the sample. In stark contrast to its closest kin, the integer quantum Hall state, the QSH state exists only in time‐reversal symmetric system (e.g., in non‐magnetic materials and without the application of external magnetic field). This article reviews the development of the understanding and construction of the QSH states after their first theoretical proposal, with an emphasis on the materials perspective. Certain semiconductor quantum wells and 2D materials with strong spin–orbit coupling have been found to support QSH states.

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Two-Dimensional Band Structure in Honeycomb Metal–Organic Frameworks

Cited by 78 publications

References 73 publications

On‐Surface Assembly of Au‐Dicyanoanthracene Coordination Structures on Au(111)

On‐Surface Assembly of Au‐Dicyanoanthracene Coordination Structures on Au(111)

Tunable Thiolate Coordination Networks on Metal Surfaces

Quantum Spin Hall Materials

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