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Carbon nanotubes in electric and magnetic fields

Jelena Klinovaja, Manuel J. Schmidt, Bernd Braunecker, and Daniel Loss
Phys. Rev. B 84, 085452 – Published 30 August 2011
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Abstract

We derive an effective low-energy theory for metallic (armchair and nonarmchair) single-wall nanotubes in the presence of an electric field perpendicular to the nanotube axis, and in the presence of magnetic fields, taking into account spin-orbit interactions and screening effects on the basis of a microscopic tight-binding model. The interplay between electric field and spin-orbit interaction allows us to tune armchair nanotubes into a helical conductor in both Dirac valleys. Metallic nonarmchair nanotubes are gapped by the surface curvature, yet helical conduction modes can be restored in one of the valleys by a magnetic field along the nanotube axis. Furthermore, we discuss electric dipole spin resonance in carbon nanotubes, and find that the Rabi frequency shows a pronounced dependence on the momentum along the nanotube.

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  • Received 16 June 2011

DOI:https://doi.org/10.1103/PhysRevB.84.085452

©2011 American Physical Society

Authors & Affiliations

Jelena Klinovaja, Manuel J. Schmidt, Bernd Braunecker, and Daniel Loss

  • Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland

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Issue

Vol. 84, Iss. 8 — 15 August 2011

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