Electronic structures of finite carbon nanotubes under external fields

Lee, C. H.; Chen, R. B.; Li, T. S.; Chang, Che‐Wei; Lin, Ming–Fa

doi:10.1088/0953-8984/18/41/009

Cited by 5 publications

(3 citation statements)

References 30 publications

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“…The quantum-size effect has been verified by experimental measurements of transport properties [3][4][5][6][7][8]. For theoretical studies on 0D CNs, first-principles calculations and the tight-binding model are used to investigate electronic structures [9][10][11][12][13][14][15], magnetic properties [12][13][14][15], and optical excitations [13].…”

Section: Introductionmentioning

confidence: 88%

Electronic structures of finite double-walled carbon nanotubes in a magnetic field

Lee

Hsue

Chen

et al. 2008

J. Phys.: Condens. Matter

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The discrete electronic states of finite double-walled armchair carbon nanotubes are obtained in a magnetic field by using the Peierls tight-binding model. State energy, wavefunction, energy gap, and density of states are investigated in detail. Electronic properties strongly depend on the intertube atomic interactions, magnitude and direction of the magnetic field, boundary structure, length, and Zeeman splitting. The intertube atomic interactions result in an asymmetric energy spectrum about the Fermi level, a drastic change in energy gap, and obvious energy shifts. The magnetic field could lead to state crossing, alter the hybridization of the inner and outer tight-binding functions, destroy state degeneracy, increase more low-energy states, and induce complete energy-gap modulations (CEGMs). The different atomic positions along the tube axis make the C5 system differ from the D5h or S5 systems. According to the lengths Nl = 3i, 3i+1, and 3i+2 (i an integer), there exist three types of magnetic-flux-dependent state energies. The Zeeman effect causes CEGMs to happen at weaker magnetic fields. The main features of quantized electronic states are directly reflected in the density of states. The predicted magneto-electronic properties could be examined by the transport and optical measurements.

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Section: Introductionmentioning

confidence: 88%

Electronic structures of finite double-walled carbon nanotubes in a magnetic field

Lee

Hsue

Chen

et al. 2008

J. Phys.: Condens. Matter

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“…The numerical results revealed that the band structure of carbon nanotubes is significantly changed under uniaxial stress when compared to BN nanotubes. Moreover, the reduction of band gap due to uniaxial stress is mainly considered to justify inducing the semiconductor–metal transition for CNTs while these changes do not take place for BN nanotubes. − …”

Section: Introductionmentioning

confidence: 99%

“…Most recently, the effect of an external electric field on nanostructures has been of great interest in promising applications including nanoelectromechanical systems and other nanoscale devices because of the variation in the electronic and mechanical properties of the nanostructures. The electric field has a great impact on the electronic properties such as band gap tuning; semiconducting metallic transition; formation of an electric field dipole moment along the direction of applied field; and circular cross section to elliptical cross section deformation of C, − BN, , SiC, and AlN nanotubes. However, the influence of the external electric field on the elastic properties of the nanotubes has not been studied extensively.…”

Section: Introductionmentioning

confidence: 99%

Tuning of Elastic Properties of Nanotubes by Imposing a Transverse Electric Field: Computational Approach

et al. 2016

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In this study, we investigated the influence of a transverse electric field on the mechanical properties of carbon, boron nitride, and silicon carbide nanotubes based on density functional theory and continuum mechanics. To evaluate the Young's modulus of the nanotubes, a compressive distribution loading was implemented in the direction perpendicular to the longitudinal axis of the nanotubes in the presence and absence of an electric field. According to the obtained results from the geometry of the deformed nanotubes, an elliptical function was used to estimate the overall deformation. Based on the Green strain theory, the displacement of each particle is defined by the conversion matrix to transform the initial circular shape of the nanotubes to the final elliptical shape. The classical continuum theory was employed to estimate the relationship between strain energy and strain field of the nanotubes. An evolutionary genetic algorithm was used to achieve an accurate estimation of the fitting of the energy function versus strain based on the elasticity theory. In addition, the effect of the electric field on the electronic and mechanical properties of the nanotubes was investigated. The numerical results revealed that the nanotubes exposed to the electric field have more effective stiffness in comparison to the similar case in the off-field condition.

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Thermal conductivity, heat capacity and magnetic susceptibility of graphene and boron nitride nanoribbons

Behzad

Chegel

2018

Diamond and Related Materials

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Electronic structures of finite carbon nanotubes under external fields

Cited by 5 publications

References 30 publications

Electronic structures of finite double-walled carbon nanotubes in a magnetic field

Electronic structures of finite double-walled carbon nanotubes in a magnetic field

Tuning of Elastic Properties of Nanotubes by Imposing a Transverse Electric Field: Computational Approach

Thermal conductivity, heat capacity and magnetic susceptibility of graphene and boron nitride nanoribbons

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