Structural stability and electronic properties of graphene/germanene heterobilayer

Hamid, Mohamad Amin Bin; Chan, K.T.; Ooi, C. H. Raymond; Zainuddin, Hishamuddin; Shah, Nurisya Mohd; Nidzam, Nazirul Nazrin Shahrol

doi:10.1016/j.rinp.2021.104545

Cited by 17 publications

(3 citation statements)

References 29 publications

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“…In structure III, the top and bottom Pb atoms are positioned over B and N, respectively. Analogous stacking patterns are reported for graphene/hBN, 29 graphene/germanene, 30 graphene/stanene, and stanene/hBN 21 heterostructures. The band structure of the optimized plumbene monolayer is displayed in Fig.…”

Section: Resultssupporting

confidence: 69%

Numerical characterization of the electronic and optical properties of plumbene/hBN heterobilayer using first-principles study

et al. 2023

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Section: Resultssupporting

confidence: 69%

Numerical characterization of the electronic and optical properties of plumbene/hBN heterobilayer using first-principles study

et al. 2023

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“…But silicene could be a great way to turn heat energy into something useful. First, from the electronic structure perspective, many studies show that silicene is the same as graphene [11], which means that it conducts electricity just as well as graphene. Second, unlike graphene, The atoms in silicene are bent, which causes an energy gap that isn't zero and makes the Seebeck coefficient bigger [12].…”

Section: ‫للغاية‬ ‫الرقيق‬ ‫الجرمانيين‬ ‫و‬ ‫للسيليسين‬ ‫ارية‬ ‫الكهر...mentioning

confidence: 99%

Theoretical Study of Electronic and Thermoelectric Properties of Ultra-Thin Silicene and Germanene

Zareed,

Dahham,

Al-Jobory

2024

Tikrit J. Pure Sci.

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In this study, we used the Non-Equilibrium Green Function (NEGF) and Density Functional Theory (DFT) to analyze the nanoscale electronic properties of silicene and germanene structures, the band structure and Density of State (DOS) for the unit cell of silicene and germanene are found that the energy gap is (0 eV) in both. A comparison was made between silicene and germanene in terms of electrical and thermal properties, by calculating the transmission coefficient T(E) for silicene patterns (Si1, Si2, Si3, and Si4) and germanene patterns (Ge1, Ge2, Ge3, and Ge4). The results show that T(E) decreases with increasing etching depth, which also leads to a decrease in electronic conductivity. Moreover, the value of the Seebeck coefficient (S) increases with increasing drilling depth, and also the sign of S varies from a positive value for (Si1, Si4, Ge1, Ge2, Ge4) to a negative value for (Si2, Si3, Ge3) at Fermi level (Ef) equal to (0 eV). The highest value of the figure of merit is about (1.8) for the Ge4 structure.

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“…We find moiré bands with spin Chern numbers up to 3, allowing realization of the quantum spin Hall effect [33,34]. We note that commensurate bilayers with exactly √ 3 lattice constant ratio and perfect 30 • alignment have been studied using density functional theory [35,36]. Moiré materials near this configuration have also been considered [37][38][39].…”

mentioning

confidence: 94%

Kagome and honeycomb flat bands in moiré graphene

Scheer¹,

Lian²

2023

Preprint

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We propose a class of graphene-based moiré systems hosting flat bands on kagome and honeycomb moiré superlattices. These systems are formed by stacking a graphene layer on a 2D substrate with lattice constant approximately √ 3 times that of graphene. When the moiré potentials are induced by a 2D irreducible corepresentation in the substrate, the model shows a rich phase diagram of low energy bands including eigenvalue fragile phases as well as kagome and honeycomb flat bands. Spin-orbit coupling in the substrate can lift symmetry protected degeneracies and create spin Chern bands, and we observe spin Chern numbers up to 3. We additionally propose a moiré system formed by stacking two graphene-like layers with similar lattice constants but opposite signs of the Dirac Fermi velocity. This system exhibits multiple kagome and honeycomb flat bands simultaneously. Both models we propose resemble the hypermagic model of Ref.[1] and may provide ideal platforms for the realization of strongly correlated topological phases.

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Structural stability and electronic properties of graphene/germanene heterobilayer

Cited by 17 publications

References 29 publications

Numerical characterization of the electronic and optical properties of plumbene/hBN heterobilayer using first-principles study

Numerical characterization of the electronic and optical properties of plumbene/hBN heterobilayer using first-principles study

Theoretical Study of Electronic and Thermoelectric Properties of Ultra-Thin Silicene and Germanene

Kagome and honeycomb flat bands in moiré graphene

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