Collective Phenomena in Multiwall Carbon Nanotubes

Margańska, Magdalena; Szopa, M.; Zipper, E.

doi:10.12693/aphyspola.106.609

Cited by 7 publications

(10 citation statements)

References 9 publications

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“…The magnetic moments are then a superposition of moments from different shells. Some aspects of this problem have recently been discussed in [13,21]. The magnetic moment per unit length in a zigzag (64,0) nanotube, at EF = 0, ±0.3γ, ±0.6γ, ±γ, both for µ chem = const and Ne = const, at T = 0K and T = 300K.…”

Section: Discussionmentioning

confidence: 99%

Orbital magnetic moments in pure and doped carbon nanotubes

2005

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The unusual band structure of carbon nanotubes (CNs) results in their remarkable magnetic properties. The application of magnetic field parallel to the tube axis can change the conducting properties of the CN from metallic to semiconducting and vice versa. Apart from that B induces (via the Bohm-Aharonov effect) orbital magnetic moments µ orb in the nanotube. These moments are studied both in pure and hole-or electron-doped CNs, isolated or in a circuit. Remarkably, µ orb in pure CNs depends uniquely on their original conducting properties, length, and temperature but it does not depend on the nanotube radius or the particular chirality. In doped nanotubes the magnetic moments can be strongly altered and depend on the radius and chirality. Temperature can even change their character from diamagnetic at low T to paramagnetic at high T . A full electron-hole symmetry in doped tubes is also revealed.

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Section: Discussionmentioning

confidence: 99%

Orbital magnetic moments in pure and doped carbon nanotubes

2005

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“…In finite temperatures, the total current is the sum of individual currents, multiplied by their Fermi-Dirac weights (for detailed derivation, see [9]):…”

Section: The Modelmentioning

confidence: 99%

Aharonov–Bohm effect in carbon nanotubes and tori

Margańska¹,

Szopa²,

Zipper³

2005

Physica Status Solidi (b)

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PACS 73.23.Ra, 73.63.Fg The carbon tori and nanotubes, either pure or hole-doped, are examined. In the two achiral (zigzag and armchair) systems the momentum lines are parallel to the edges of the Brillouin zone or the3 03 eV is the overlap integral for graphene) contour. The amplitude and shape of the persistent currents in these cases is predicted by an analysis of the geometry of the reciprocal space, and confirmed by a numerical simulation. Special attention is paid to the differences between the currents in straight nanotube and nanotorus topologies, and other possible configurations of chirality and doping at which the persistent currents may be enhanced are hinted at.

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“…If the two ends of a nanotube are connected, the boundary condition along the axis becomes periodic. The resultant geometry, a torus, possesses an important structural degree of freedom called "twist" [9]. Twist can mix the motions along and around the axis, and is thus expected to affect the solid state properties.…”

Section: Time-reversal Symmetric Gauge Fieldmentioning

confidence: 99%