Peculiar Localized State at Zigzag Graphite Edge

Fujita, M.; Wakabayashi, Keiji; Nakada, Kyoko; Kusakabe, Koichi

doi:10.1143/jpsj.65.1920

Cited by 2,782 publications

(2,948 citation statements)

References 15 publications

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“…This conclusion is in striking difference from the case of ZZ-GNRs, where the ground electronic state was found to have an AFM spin ordering regardless of the dimensions of the ribbon. [19][20][21][22][23][24][25][26]28,29,42,[45][46][47][48][49][50][51][52] Interestingly, contradicting results have been reported in the literature, 33 indicating that the ground state of unpassivated zigzag CNTs has a low-spin AFM ordering even for nanotubes that have earlier been considered to present a high-spin ferromagnetically ordered ground state. 32 In light of the considerable progress that has been made in the synthesis and fabrication of ultra-short [60][61][62][63][64] and open ended 65 CNTs and ultra-narrow GNRs, [66][67][68][69] it is desirable to obtain a full understanding of their electronic properties.…”

Section: Introductionmentioning

confidence: 93%

“…30,40,43 A unique mechanism for spin ordering in graphene based systems is related to the appearance of edge states. [18][19][20][21][22][23][24][25][26][27][28][29]42,[45][46][47][48][49][50][51][52] When cutting a graphene sheet along its zigzag axis to form a narrow and elongated graphene nanoribbon (GNR), distinct electronic states appear, which are localized around the exposed edges. [54][55][56][57][58][59] These states are predicted to carry spin polarization, resulting in a well defined magnetic ordering.…”

Section: Introductionmentioning

confidence: 99%

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Half-Metallic Zigzag Carbon Nanotube Dots

Hod

Scuseria

2008

ACS Nano

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A comprehensive first-principles theoretical study of the electronic properties and half-metallic nature of finite zigzag carbon nanotubes is presented. Unlike previous reports, we find that all nanotubes studied present a spin-polarized ground state, where opposite spins are localized at the two zigzag edges in a long-range antifferomagnetic configuration. Relative stability analysis of the different spin states indicate that, for the shorter segments, spin-ordering should be present even at room temperature. The energy gap between the highest occupied and the lowest unoccupied molecular orbitals of the finite systems is found to be inversely proportional to the nanotubes segments length, suggesting a route to control their electronic properties. Similar to the case of zigzag graphene nanoribbons, half-metallic behavior is obtained under the influence of an external axial electric field.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Half-Metallic Zigzag Carbon Nanotube Dots

Hod

Scuseria

2008

ACS Nano

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“…Graphene is a gapless semiconductor [65], but when structuring the graphene into a nanometer-sized ribbon, its properties change depending on the edge profiles. Theoretical studies show that an armchair ribbon will be semiconducting [66][67][68][69] and that a zigzag-edged ribbon is metallic with a current profile that peaks at the edges [66,[69][70][71]. Both armchair and zigzag nanoribbons have been proposed to present promising platforms for DNA sequencing in a large number of theoretical reports [72][73][74][75][76][77][78][79], and experimentalists have begun to explore this approach [80][81][82][83][84][85].…”

Section: Inplane Transport Of a Graphene Nanoribbon With A Nanoporementioning

confidence: 99%

Graphene nanodevices for DNA sequencing

2016

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Fast, cheap, and reliable DNA sequencing could be one of the most disruptive innovations of this decade as it will pave the way for personalised medicine. In pursuit of such technology, a variety of nanotechnology-based approaches have been explored and established including sequencing with nanopores. Due to its unique structure and properties, graphene provides interesting opportunities for the development of a new sequencing technology. In recent years, a wide range of creative ideas for graphene sequencers have been theoretically proposed and the first experimental demonstrations have begun to appear. Here, we review the different approaches to using graphene nanodevices for DNA sequencing, which involve DNA passing through graphene nanopores, nanogaps, and nanoribbons, and the physisorption of DNA on graphene nanostructures. We discuss the advantages and problems of each of these key techniques, and provide a perspective on the use of graphene in future DNA sequencing technology.

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“…The magnetic ordering has been predicted based on the band structures. The HOCO (highest occupied crystal orbital) and LUCO (lowest unoccupied crystal orbital) contact and become flat at the wavenumber region |k|>2π/3 (Fujita et al, 1996). Thus, at least within the same edge, ferromagnetic interactions are expected.…”

Section: Methylene-edged Graphenesmentioning

confidence: 99%

Electronic States of Graphene-Based Ferromagnets

Hatanaka¹

2011

Graphene Simulation

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Peculiar Localized State at Zigzag Graphite Edge

Cited by 2,782 publications

References 15 publications

Half-Metallic Zigzag Carbon Nanotube Dots

Half-Metallic Zigzag Carbon Nanotube Dots

Graphene nanodevices for DNA sequencing

Electronic States of Graphene-Based Ferromagnets

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