Quantum Size Effects in Carbon Nanotube Intramolecular Junctions

Rochefort, and Alain; Avouris, Phaedon

doi:10.1021/nl015705t

Cited by 48 publications

(46 citation statements)

References 19 publications

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“…The lowest-lying interface state, labeled I1, is mainly localized at the interface, spreading towards the armchair side. This behavior was also observed in the interface states of (12, 0)/(6, 6) SLs and (10, 0)/(5, 5) junctions [23,24]. However, the second interface state (labeled I2) spreads considerably from the interface into the zigzag part.…”

Section: Interface States In Achiral Carbon Nanotube Junctionsmentioning

confidence: 58%

Unzipped and Defective Nanotubes: Rolling up Graphene and Unrolling Tubes

et al. 2010

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The properties of carbon nanotubes can be dramatically altered by the presence of defects. In this work we address the properties of two different kinds of defective nanotubes: junctions of achiral tubes with topological defects and partially unzipped carbon nanotubes. In particular, we begin by focussing on the interface states in carbon nanotube junctions between achiral tubes. We show that their number and energies can be derived by applying the Born-von Karman boundary condition to an interface between armchair-and zigzag-terminated semi-infinite graphene layers. We show that these interface states, which were thought to be due to the presence of topological defects, are in fact related to the graphene zigzag edge states. Secondly, we study partially unzipped carbon nanotubes, which can be considered as the junction of a carbon nanotube and a graphene nanoribbon, which has edge features giving rise to novel properties. Carbon nanoribbons act as transparent contacts for nanotubes and viceversa, yielding a high conductance. At certain energies, nanoribbons behave as valley filters for carbon nanotubes; this holds considering electron-electron interaction effects. Furthermore, the application of a magnetic field turns the system conducting, with a 100% magnetoresistance. These novel structures may open a way for new carbon-based devices.

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Section: Interface States In Achiral Carbon Nanotube Junctionsmentioning

confidence: 58%

Unzipped and Defective Nanotubes: Rolling up Graphene and Unrolling Tubes

et al. 2010

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“…Many works, both in theory [59][60][61][62][63] and in experiment, have been performed to clarify the real electrical properties of the SWNT/SWNT junctions. By simulation, Rochefort and Avouris reported that a (5,5)/(10,0) junction could exhibit a rectifying behavior for lengths as small as 4 nm, and introduce a conductance gap (about 2 eV) and new states near the Fermi energy.…”

Section: Electrical Propertiesmentioning

confidence: 99%

“…The new states reflected the charge transferring across the junction, which caused a very low conductance over a wide range of energies. [63] Experimentally, in 1999, Yao et al first reported electrical transport measurements on the SWNT/SWNT junctions. [9] Current-voltage (I-V) curves measured across an M-S junction (Fig.…”

Section: Electrical Propertiesmentioning

confidence: 99%

“…The p-n, [92] M-S [59,61,64] junctions have good rectifying properties. M-S junctions can be used for quantum devices, [138,139] while the p-n junctions of CNTs can be used as negative differential resistance devices, [140,141] or photovoltaic devices with a maximum energy conversion efficiency as high as tens of percent. [134,135] Experimentally, various devices have been fabricated based on 1D CNT junctions.…”

Section: Applicationsmentioning

confidence: 99%

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The Intramolecular Junctions of Carbon Nanotubes

2008

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For the miniaturization of microelectronics, carbon nanotubes (CNTs) are regarded as ideal candidates for the next generation of nanoelectronics because of their excellent properties. To realize CNT‐based electronics, intramolecular junctions are required components, which can not only connect different CNTs for integration, but can also act as functional building blocks in the circuit, such as rectifiers, field‐effect transistors, switches, amplifiers, photoelectrical devices, etc. Therefore, intense attention has been focused on this topic and many advances have been achieved, especially in recent years. On the other hand, some challenges also exist. To provide researchers with a comprehensive overview of this field, this review discusses the synthesis, properties, and applications of intramolecular junctions of CNTs in detail. Among them, the applications of CNT integration are discussed specially. Furthermore, a brief summary and an outlook of future work are provided.

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“…Electronic structure of such heterojunctions was addressed first in Ref. [6] by employing the extended Huckel model. Subsequently, similar calculations were performed within the framework of other models [7].…”

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confidence: 99%

Peculiarities of conductance of carbon nanotube‐based quantum dots

Ogloblya

Prylutskyy

Strzhemechny

2009

Int J of Quantum Chemistry

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ABSTRACT:Within the framework of the surface Green's function matching method, we carried out calculations of the differential conductance of symmetrically and asymmetrically connected armchair (n, n)-zigzag (2n, 0)-armchair (n, n) carbon nanotubes with different lengths of the middle section and infinitely long ends. It is shown that the (n, n)/(2n, 0)/(n, n) segment, when n is not a multiple of 3, behaves as a quantum dot and has a conduction gap even for short middle segments. The position of the conductance peeks closest to the Fermi energy is determined by the interface states of the (n, n)/(2n, 0) junction. In addition to conductance peaks originating from the interface states of the (n, n)/(2n, 0) heterojunction, for sufficiently long middle zigzag nanotube, there are more conductance peaks in the vicinity of the Fermi energy, and those stem from the electronic structure of an individual finite (2n, 0) zigzag nanotube. However, positions of the peaks farther away from the Fermi energy cannot be found in such a simple way. Thus, such (n, n)/(2n, 0)/(n, n) quantum dot has singularities in its electronic properties, which may yield the Coulomb blockade effect should those strongly localized discrete levels become occupied.

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Quantum Size Effects in Carbon Nanotube Intramolecular Junctions

Cited by 48 publications

References 19 publications

Unzipped and Defective Nanotubes: Rolling up Graphene and Unrolling Tubes

Unzipped and Defective Nanotubes: Rolling up Graphene and Unrolling Tubes

The Intramolecular Junctions of Carbon Nanotubes

Peculiarities of conductance of carbon nanotube‐based quantum dots

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