Topological and Stacked Flat Bands in Bilayer Graphene with a Superlattice Potential

Ghorashi, Sayed Ali Akbar; Dunbrack, Aaron; Abouelkomsan, Ahmed; Sun, Jiacheng; Du, Xu; Cano, Jennifer

doi:10.1103/physrevlett.130.196201

Cited by 44 publications

(5 citation statements)

References 94 publications

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“…For example, for CrOCl, the Fermi surfaces under different Fermi energies (above the conduction band minimum) are given in Supplementary Figure 15 c. Clearly, under some proper fillings, the Fermi surfaces are nested or partially nested, which may give rise to CDW states with anisotropic superlattices. We note that topologically nontrivial flat bands have also been proposed to exist in Bernal bilayer graphene coupled with a background superlattice potential 52 .…”

Section: Resultsmentioning

confidence: 78%

Synergistic correlated states and nontrivial topology in coupled graphene-insulator heterostructures

Lu,

Zhang,

Wang

et al. 2023

Nat Commun

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Graphene has aroused great attention due to the intriguing properties associated with its low-energy Dirac Hamiltonian. When graphene is coupled with a correlated insulating substrate, electronic states that cannot be revealed in either individual layer may emerge in a synergistic manner. Here, we theoretically study the correlated and topological states in Coulomb-coupled and gate-tunable graphene-insulator heterostructures. By electrostatically aligning the electronic bands, charge carriers transferred between graphene and the insulator can yield a long-wavelength electronic crystal at the interface, exerting a superlattice Coulomb potential on graphene and generating topologically nontrivial subbands. This coupling can further boost electron-electron interaction effects in graphene, leading to a spontaneous bandgap formation at the Dirac point and interaction-enhanced Fermi velocity. Reciprocally, the electronic crystal at the interface is substantially stabilized with the help of cooperative interlayer Coulomb coupling. We propose a number of substrate candidates for graphene to experimentally demonstrate these effects.

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Section: Resultsmentioning

confidence: 78%

Synergistic correlated states and nontrivial topology in coupled graphene-insulator heterostructures

Lu,

Zhang,

Wang

et al. 2023

Nat Commun

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“…10 and Note 2 ). This electronic reconstruction leads to the formation of electron domain walls that confine Fermi electrons on either side, resulting in an equipotential Fermi surface and energy barriers with neighboring surfaces 17 . The electron trapping effect leads to a closer proximity of valence electrons in graphene superlattice to the Fermi level, resulting in the formation of multiple van Hoff singularities 18 , as demonstrated by the distribution of electronic density of states in Fig.…”

Section: Resultsmentioning

confidence: 99%

Functional nanoporous graphene superlattice

Lv,

Yao,

Yuan

et al. 2024

Nat Commun

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Two-dimensional (2D) superlattices, formed by stacking sublattices of 2D materials, have emerged as a powerful platform for tailoring and enhancing material properties beyond their intrinsic characteristics. However, conventional synthesis methods are limited to pristine 2D material sublattices, posing a significant practical challenge when it comes to stacking chemically modified sublattices. Here we report a chemical synthesis method that overcomes this challenge by creating a unique 2D graphene superlattice, stacking graphene sublattices with monodisperse, nanometer-sized, square-shaped pores and strategically doped elements at the pore edges. The resulting graphene superlattice exhibits remarkable correlations between quantum phases at both the electron and phonon levels, leading to diverse functionalities, such as electromagnetic shielding, energy harvesting, optoelectronics, and thermoelectrics. Overall, our findings not only provide chemical design principles for synthesizing and understanding functional 2D superlattices but also expand their enhanced functionality and extensive application potential compared to their pristine counterparts.

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“…1(a)) is cut out of a graphene monolayer. 92–96 It is a closed flat structure formed of four carbon chains connected by four benzenes rings with four Ni atoms attached. The benzenes are necessary in order to create a chemically correct flat structure and the H atoms saturate the bonds.…”

Section: Resultsmentioning

confidence: 99%

Using single and double laser pulses on the molecular Ni₄@C₄₈H₃₆ system to design integrated nanospintronic units

Barhoumi,

Liu,

Hübner

et al. 2024

Phys. Chem. Chem. Phys.

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Topological and Stacked Flat Bands in Bilayer Graphene with a Superlattice Potential

Cited by 44 publications

References 94 publications

Synergistic correlated states and nontrivial topology in coupled graphene-insulator heterostructures

Synergistic correlated states and nontrivial topology in coupled graphene-insulator heterostructures

Functional nanoporous graphene superlattice

Using single and double laser pulses on the molecular Ni₄@C₄₈H₃₆ system to design integrated nanospintronic units

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Topological and Stacked Flat Bands in Bilayer Graphene with a Superlattice Potential

Cited by 44 publications

References 94 publications

Synergistic correlated states and nontrivial topology in coupled graphene-insulator heterostructures

Synergistic correlated states and nontrivial topology in coupled graphene-insulator heterostructures

Functional nanoporous graphene superlattice

Using single and double laser pulses on the molecular Ni4@C48H36 system to design integrated nanospintronic units

Contact Info

Product

Resources

About

Using single and double laser pulses on the molecular Ni₄@C₄₈H₃₆ system to design integrated nanospintronic units