Edge-Dependent Topology in Kekulé Lattices

Freeney, S. E.; Broeke, J. J. van den; Veen, A. J. J. Harsveld van der; Swart, Ingmar; Smith, C. Morais

doi:10.1103/physrevlett.124.236404

Cited by 44 publications

(41 citation statements)

References 26 publications

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“… 19 In that work, the confinement of the surface-state electrons in a honeycomb geometry by CO molecules leads to a Dirac cone formed by the first two surface bands at the high symmetry K point. It has been shown afterward that this concept can be extended to create systems with different geometries, 20 fractal structures, 21 nontrivial topology, 22 , 23 and multiple orbitals by changing the size of the lattice sites. 24 Using this last concept, we design honeycomb lattices consisting of atomic sites with a variable degree of quantum confinement and electronic coupling between them.…”

Section: Resultsmentioning

confidence: 99%

p Orbital Flat Band and Dirac Cone in the Electronic Honeycomb Lattice

et al. 2020

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Theory anticipates that the in-plane p x , p y orbitals in a honeycomb lattice lead to potentially useful quantum electronic phases. So far, p orbital bands were only realized for cold atoms in optical lattices and for light and exciton-polaritons in photonic crystals. For electrons, in-plane p orbital physics is difficult to access since natural electronic honeycomb lattices, such as graphene and silicene, show strong s–p hybridization. Here, we report on electronic honeycomb lattices prepared on a Cu(111) surface in a scanning tunneling microscope that, by design, show (nearly) pure orbital bands, including the p orbital flat band and Dirac cone.

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Section: Resultsmentioning

confidence: 99%

p Orbital Flat Band and Dirac Cone in the Electronic Honeycomb Lattice

et al. 2020

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“…Building on this approach, an electronic Lieb-lattice [27], quasi-crystal [28] and electronic fractal [29] have been realized. Recently, it was shown that this material platform can also be used to study topological states of matter [31,33].…”

Section: Introductionmentioning

confidence: 99%

Coupling quantum corrals to form artificial molecules

et al. 2020

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Quantum corrals can be considered artificial atoms. By coupling many quantum corrals together, artificial matter can be created at will. The atomic scale precision with which the quantum corrals can be made grants the ability to tune parameters that are difficult to control in real materials, such as the symmetry of the states that couple, the on-site energy of these states, the hopping strength and the magnitude of the orbital overlap. Here, we systematically investigate the accessible parameter space for the CO on Cu(111) platform by constructing (coupled) quantum corrals of different sizes and shapes. By changing the configuration of the CO molecules that constitute the barrier between two quantum corrals, the hopping integral can be tuned between 0 and -0.3 eV for s- and p-like states, respectively. Incorporation of orbital overlap is essential to account for the experimental observations. Our results aid the design of future artificial lattices.

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“…The electronic Kagome-honeycomb lattice emerges as "antilattice" to the circumcoronene superlattice, whereby individual molecule acts as a hexagonal repulsive barrier for 2DEG. The underlying physical picture is remarkably similar to the artificial electronic lattices [35][36][37][38][39][40][41] patterned by CO molecules on Cu(111) surface via STM manipulation, wherein each CO molecule also acts as a repulsive scatter for 2DEG. Although STM manipulation endows an ultimate control over the lattice topology, this approach is unsuitable for practical applications due to a lack of scalability.…”

Section: Flat Bands In the Chiral Electronicmentioning

confidence: 63%

Ultra-high Yield On-surface Synthesis and Assembly of Circumcoronene into Chiral Electronic Kagome-honeycomb Lattice

Telychko

Li²,

Mutombo³

et al. 2020

Preprint

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On-surface synthesis has revealed remarkable potential in the fabrication of a plethora of elusive nanographenes with tailored structural, electronic and magnetic properties unattainable by conventional wet-chemistry synthesis. Unfortunately, surface-assisted synthesis often involves multiple-step cascade reactions with competing pathways, leading to the formation of a diversity of products with limited yield, which reduces its feasibility towards the large-scale production for future technological applications. Here, we devise a new on-surface synthetic strategy for the ultra-high yield synthesis of a hexagonal nanographene with six zigzag edges, namely circumcoronene on Cu(111) via surfaceassisted intramolecular dehydrogenation of the rationally-designed precursor molecule, followed by methyl radical-radical coupling and aromatization. An elegant electrostatic interaction between circumcoronene and Cu(111) drives their self-organization into an extended superlattice, as revealed by bond-resolved low-temperature scanning probe microscopy and spectroscopy measurements. Density functional theory and tight-binding calculations reveal that unique hexagonal zigzag topology of circumcoronenes, along with their periodic electrostatic landscape confines two-dimensional (2D) electron gas in Cu(111) surface into chiral electronic Kagome-honeycomb lattice with two emergent electronic flat bands. Our findings open up a new route for the high-yield fabrication of elusive nanographenes with zigzag topologies and their novel 2D superlattices with possible nontrivial electronic properties towards their future technological applications.

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Edge-Dependent Topology in Kekulé Lattices

Cited by 44 publications

References 26 publications

p Orbital Flat Band and Dirac Cone in the Electronic Honeycomb Lattice

p Orbital Flat Band and Dirac Cone in the Electronic Honeycomb Lattice

Coupling quantum corrals to form artificial molecules

Ultra-high Yield On-surface Synthesis and Assembly of Circumcoronene into Chiral Electronic Kagome-honeycomb Lattice

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