Palgraphyne: A Promising 2D Carbon Dirac Semimetal with Strong Mechanical and Electronic Anisotropy

Zhao, Ding; Cui, Leyuan; Cai, Jiangtao; Guo, Yanqing; Cui, Xin; Song, Tao; Liu, Zhifeng

doi:10.1002/pssr.201900670

Cited by 19 publications

(19 citation statements)

References 70 publications

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“…The results show that the Fermi velocities of the Dirac point D 1 along the ΓÀX direction and D 2 along the XÀS direction are 6.55 Â 10 5 , 1.55 Â 10 4 and 3.86 Â 10 5 , 9.13 Â 10 4 m s À1 . The largest Fermi velocity is 6.55 Â 10 5 m s À1 , which is smaller than that of graphene (9.0 Â 10 5 m s À1 ) [10] but larger than those of α-graphdiyne (1.10 Â 10 5 m s À1 ), [69] ph-graphene (2.80 Â 10 5 m s À1 ), [39] and 6,6,12-graphyne (1.68-6.29 Â 10 5 m s À1 ). [70] The results show that TPH-graphene with high electron transfer ability has great potential applications in nanoelectronics.…”

Section: Resultsmentioning

confidence: 80%

“…Due to the bonding flexibility of carbon atoms, numerous 2D carbon allotropes have been proposed theoretically. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] These carbon allotropes exhibit some amazing properties, such as ultrahigh ideal strength, [9] high electron mobility at room temperature, [8] superconductivity, [22] good catalytic activity, [23] ferromagnetism, [24] and negative Poisson's ratio. [9,25] It is no doubt that the fascinating properties will encourage further investigations of these 2D carbon materials.…”

Section: Introductionmentioning

confidence: 99%

“…[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%

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Dirac Semimetal Protected by Nonsymmorphic Mirror Symmetries in TPH‐Graphene

Liang

Wang

et al. 2021

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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: Resultsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dirac Semimetal Protected by Nonsymmorphic Mirror Symmetries in TPH‐Graphene

Liang

Wang

et al. 2021

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“…Such band crossing characteristics are protected by crystal symmetry, which makes them have a very attractive application prospect in electronic devices, semiconductors, and other fields. [ 128 ] Whereas, topological Dirac materials discovered so far usually contain heavy metal elements, which are confronted with some tough problems that are not conductive to practical applications, for example, environmental pollution, high cost, and material safety. Therefore, it is necessary to explore light elements to compose stable topological materials.…”

Section: Properties Of Borophenementioning

confidence: 99%

The Emergence and Evolution of Borophene

et al. 2021

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Neighboring carbon and sandwiched between non‐metals and metals in the periodic table of the elements, boron is one of the most chemically and physically versatile elements, and can be manipulated to form dimensionally low planar structures (borophene) with intriguing properties. Herein, the theoretical research and experimental developments in the synthesis of borophene, as well as its excellent properties and application in many fields, are reviewed. The decade‐long effort toward understanding the size‐dependent structures of boron clusters and the theory‐directed synthesis of borophene, including bottom‐up approaches based on different foundations, as well as up‐down approaches with different exfoliation modes, and the key factors influencing the synthetic effects, are comprehensively summarized. Owing to its excellent chemical, electronic, mechanical, and thermal properties, borophene has shown great promise in supercapacitor, battery, hydrogen‐storage, and biomedical applications. Furthermore, borophene nanoplatforms used in various biomedical applications, such as bioimaging, drug delivery, and photonic therapy, are highlighted. Finally, research progress, challenges, and perspectives for the future development of borophene in large‐scale production and other prospective applications are discussed.

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“…[ 41–44 ] In addition, more and more carbon‐based materials are being discovered for their excellent performance. [ 45–49 ] Recently, a new strategy has focused on managing phonons with nanoporous graphene (NPG) design, which aid effective heat control by engineering phonon band structures. [ 50 ] Especially, the manipulation of phonons in NPG is governed by phonon confinement and coherent interference mechanisms.…”

Section: Figurementioning

confidence: 99%

Design of Thermal Metamaterials with Excellent Thermal Control Functions by Using Functional Nanoporous Graphene

Jia

Zhang

et al. 2020

Physica Rapid Research Ltrs

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Heat flux manipulation has garnered extensive research attention due to its potential application in thermal management devices, such as heat sink, [1,2] thermal diode, [3-6] thermal transistor, [7] and thermal memory. [8] Yet until now, we were not able to control heat flux as we do with electric current. Considerable effort of researchers to investigate possible transport mechanism of microscopic particles, such as photons [9] and phonons, [10-12] has led to some significant conclusions. For instance, in 2006, Leonhardt and Pendry. [13,14] established the transformation optics theory and proposed the concept of invisible cloak, which have also been verified by subsequent experiments. Inspired by this, in 2008, Fan et al. [15] first applied the transformation theory in the field of heat transfer, and theoretically predicted the mode of thermal invisible cloak based on graded thermal metamaterial, in which the thermal conduction equation remains form invariant under coordinate transformation. However, the adverse establishing conditions of transformation thermotics theory limit the practical implementation of thermal invisible cloak. Until 2012, Narayana and Sato [16] successfully fabricated a thermal invisible cloak by constructing a concentric layered structure consisting of alternating layers of two different homogeneous isotropic thermal conductivities. Since then, a variety of thermal metamaterials, including thermal cloak and thermal concentrator, have been proposed, and some of them have been experimentally realized, [17-25] paving the way for follow-up research. It is worth noting that these novel thermal phenomena in above-mentioned metamaterials are mostly based on macroscopic compound structures such as metal/polymer. Since 2004, significant research has been directed toward two-dimensional (2D) materials. [26-31] Graphene, as a representative 2D material, is considered as a promising candidate for next-generation electronic and optoelectronic devices due to its exceptional charge carrier mobility and 2D nature. [32-36] In addition, ultrahigh phonon-dominated thermal conductivity of graphene facilitates its use as heat sinks in integrated circuits. [1,2,37] Moreover, the fast response speed in graphene induced by large phonon group velocity can be applied in thermal devices performed with phonons. For example, Wang et al. studied the thermal rectification (TR) effect in asymmetrically defected graphene nanoribbon (GNR) and showed that singlevacancies and Si defects are more preferable in thermal rectifier fabrication. [38] A similar result has been obtained by experimental studies on asymmetrically defected GNR. [39] Furthermore, Pal and Puri realized the function of thermal logic gate based on two asymmetric graphene thermal diodes.

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Palgraphyne: A Promising 2D Carbon Dirac Semimetal with Strong Mechanical and Electronic Anisotropy

Cited by 19 publications

References 70 publications

Dirac Semimetal Protected by Nonsymmorphic Mirror Symmetries in TPH‐Graphene

Dirac Semimetal Protected by Nonsymmorphic Mirror Symmetries in TPH‐Graphene

The Emergence and Evolution of Borophene

Design of Thermal Metamaterials with Excellent Thermal Control Functions by Using Functional Nanoporous Graphene

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