Electronic and optical properties of non-hexagonal Dirac material S-graphene sheet and nanoribbons

Nath, S.; Bandyopadhyay, Amitava; Datta, Sujoy; Uddin, M. M.; Jana, Debnarayan

doi:10.1016/j.physe.2020.114087

Cited by 28 publications

(14 citation statements)

References 47 publications

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“…[39] According to a general two-band von NeumannÀ Wigner theorem, [35,36] the symmetric constraint of the systems may ensure the appearance of Dirac points. Besides hexagonal systems, the Dirac points can exist in 2D orthorhombic and tetragonal systems, including α-graphdiyne, [40] S-graphene, [41] palgraphyne, [10] and HOT graphene. [42] Further, azugraphene, [43] StoneÀWales graphene, [44] borophosphene, [45] cp-graphyne, [19] and circumcoro-graphyne [46] also exhibit linear band dispersion and associated Dirac points.…”

Section: Introductionmentioning

confidence: 99%

Dirac Semimetal Protected by Nonsymmorphic Mirror Symmetries in TPH‐Graphene

Liang

Wang

et al. 2021

Physica Rapid Research Ltrs

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Dirac cones in 2D carbon allotropes are generally protected by symmorphic symmetry operations. Herein, it is proposed that TPH-graphene has Dirac cones protected by nonsymmorphic mirror symmetries. This monolayer is composed of tetragonal, pentagonal, and heptagonal carbon rings and exhibits not only good mechanical and dynamic stability but also high energetic stability. The structure has anisotropic mechanical properties, and its Young's modulus is close to that of graphene, up to 291 N m À1 . The Dirac points on high-symmetry lines ΓÀX and XÀS are protected by the nonsymmorphic mirror operations fm 010 j0, 1=2, 0g and fm 100 j0, 1=2, 0g, respectively. The edge states obtained from semi-infinite structures confirm the nontrivial topological nature of these cones. The work reveals that TPH-graphene is an excellent candidate to study nonsymmorphicsymmetry-protected Dirac cones in 2D carbon materials.

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Section: Introductionmentioning

confidence: 99%

Dirac Semimetal Protected by Nonsymmorphic Mirror Symmetries in TPH‐Graphene

Liang

Wang

et al. 2021

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“…It is needless to mention that the real space decimation method discussed above can be successfully applied to any other two-dimensional carbon system exhibiting Dirac fermions. 4 In the vast carbon family, S-graphene 14,53 is one of the prominent examples where the real space decimation technique 15 maps the original system to two decoupled honeycomb lattices. The renormalized lattice is essentially a two-level system with a band structure identical to the original lattice near the Fermi level.…”

Section: Application To Two-dimensional Dirac Systemsmentioning

confidence: 99%

“…14 In contrast to the other two family members, S-graphene shows two distinct Dirac points in its irreducible Brillouin zone. 53 This exciting behaviour of S-graphene has also been addressed using the real space decimation technique. 15 The decimation mechanism that reduces atomic sites per unit cell from eight to two essentially decouples the low-energy lattice into two non-interacting hexagons.…”

Section: Introductionmentioning

confidence: 99%

Application of the real space decimation method in determining intricate electronic phases of matter: a review

Mukherjee

Bandyopadhyay

Jana

2023

Phys. Chem. Chem. Phys.

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“…30 Semimetallic features have also been reported in sheets such as S-graphene. 31,32 In contrast, aand b-phographene, constructed of 5-, 6-, and 8-carbon rings, are metals. 33 In addition, T-graphene, a tetra-ring of carbon atoms, shows metallic behavior.…”

Section: Marzieh Nadafanmentioning

confidence: 99%