scholarly journals Interplay between structural deformations and flat band phenomenology in twisted bilayer antimonene

RSC Advances ◽  
2021 ◽  
Vol 11 (45) ◽  
pp. 27855-27859
Author(s):  
Alan C. R. Souza ◽  
Matheus J. S. Matos ◽  
Mario S. C. Mazzoni
Keyword(s):  
Electron Acceptor ◽  
Flat Band ◽  
Electron Localization ◽  
Energy Position ◽  
Flat Bands ◽  
Noncovalent Functionalization ◽  
Structural Deformations ◽  
Acceptor Molecules

Strong interlayer interactions allows for electron localization and emergence of flat bands in relatively higher twist angles in Sb bilayer. Noncovalent functionalization with electron acceptor molecules may modulate their energy position.

scholarly journals Flat Band and Hole-induced Ferromagnetism in a Novel Carbon Monolayer

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Jing-Yang You ◽  
Bo Gu ◽  
Gang Su
Keyword(s):  
Density Functional ◽  
Doping Concentration ◽  
Carbon Materials ◽  
Density Functional Theory Calculations ◽  
Hole Doping ◽  
Flat Band ◽  
Ferromagnetic Transition ◽  
Functional Theory ◽  
Flat Bands ◽  
Half Metal

AbstractIn recent experiments, superconductivity and correlated insulating states were observed in twisted bilayer graphene (TBG) with small magic angles, which highlights the importance of the flat bands near Fermi energy. However, the moiré pattern of TBG consists of more than ten thousand carbon atoms that is not easy to handle with conventional methods. By density functional theory calculations, we obtain a flat band at EF in a novel carbon monolayer coined as cyclicgraphdiyne with the unit cell of eighteen atoms. By doping holes into cyclicgraphdiyne to make the flat band partially occupied, we find that cyclicgraphdiyne with 1/8, 1/4, 3/8 and 1/2 hole doping concentration shows ferromagnetism (half-metal) while the case without doping is nonmagnetic, indicating a hole-induced nonmagnetic-ferromagnetic transition. The calculated conductivity of cyclicgraphdiyne with 1/8, 1/4 and 3/8 hole doping concentration is much higher than that without doping or with 1/2 hole doping. These results make cyclicgraphdiyne really attractive. By studying several carbon monolayers, we find that a perfect flat band may occur in the lattices with both separated or corner-connected triangular motifs with only including nearest-neighboring hopping of electrons, and the dispersion of flat band can be tuned by next-nearest-neighboring hopping. Our results shed insightful light on the formation of flat band in TBG. The present study also poses an alternative way to manipulate magnetism through doping flat band in carbon materials.

Aromatic interactions of allenyl-anthracene derivatives with pi-electron acceptor molecules: an experimental and computational study

2019 ◽  
Vol 32 (1) ◽  
pp. 39-48
Author(s):  
Ángel Vidal-Vidal ◽  
José-Lorenzo Alonso-Gómez ◽  
María Magdalena Cid ◽  
Marta Marín-Luna
Keyword(s):  
Electron Acceptor ◽  
Computational Study ◽  
Aromatic Interactions ◽  
Anthracene Derivatives ◽  
Acceptor Molecules

Mapping spin distributions in electron acceptor molecules adsorbed on nanostructured graphene by the Kondo effect

2014 ◽  
Vol 630 ◽  
pp. 356-360 ◽  
Author(s):  
Manuela Garnica ◽  
Fabián Calleja ◽  
Amadeo L. Vázquez de Parga ◽  
Rodolfo Miranda
Keyword(s):  
Electron Acceptor ◽  
Kondo Effect ◽  
Spin Distributions ◽  
Acceptor Molecules

Electronic anomalies in dilute synthetic metals

1971 ◽  
Vol 321 (1547) ◽  
pp. 445-460 ◽  
Keyword(s):  
Electron Acceptor ◽  
Limited Extent ◽  
Extended Families ◽  
Hall Effects ◽  
Acceptor Molecules

Extended families of synthetic p metals can be prepared by controlled intercalation of electron acceptor molecules between the carbon hexagon networks of well oriented graphite. Resistivities and Hall coefficients have been determined down to 1.8 K for graphite bisulphates and (to a more limited extent) for graphite perchlorates. For many of these dilute synthetic metals, peak anomalies are found in Hall effects at around 20 K . These are discussed in relation to possible changes in the structure of the intercalate layers with temperature.

scholarly journals Flat-band dark polaritons in two-dimensional chiral-waveguide quantum electrodynamics

2021 ◽  
Vol 2015 (1) ◽  
pp. 012088
Author(s):  
Y. Marques ◽  
I. A. Shelykh ◽  
I. V. Iorsh
Keyword(s):  
Quantum Dots ◽  
Quantum Electrodynamics ◽  
Semiconductor Quantum Dots ◽  
Flat Band ◽  
Combined Effects ◽  
Strongly Correlated ◽  
Two Dimensional ◽  
One Dimensional ◽  
Flat Bands ◽  
The One

Abstract We consider a two-dimensional extension of the one-dimensional waveguide quantum electrodynamics and investigate the nature of linear excitations in two-dimensional arrays of qubits (particularly, semiconductor quantum dots) coupled to networks of chiral waveguides. We show that the combined effects of chirality and long-range photon mediated qubit-qubit interactions lead to the emergence of the two-dimensional flat bands in the polaritonic spectrum, corresponding to slow strongly correlated light.

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