Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 59: TR: Topological Insulators 2 (jointly with HL and MA)

TT 59.8: Vortrag

Freitag, 18. März 2011, 12:30–12:45, HSZ 03

Helical modes in carbon nanotubes generated by strong electric fields — •Jelena Klinovaja, Manuel J. Schmidt, Bernd Braunecker, and Daniel Loss — Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland

Helical modes, conduction channels transporting opposite spins in opposite directions, naturally lead to spin filtering, but they have also potential application as Cooper pair splitters and, if in proximity with a superconductor, lead to Majorana bound states at the edges of the conductor. Helical modes have also attracted much attention recently in the context of topological insulators. Such physics may be achieved in CNTs [1]. This is a consequence of the interplay between spin-orbit interaction and strong electric fields. Starting from a tight-binding model we derive the effective low-energy Hamiltonian and the resulting spectrum. Helical modes are shown to exist in metallic armchair nanotubes in an all-electric setup. The helical regime can also be obtained in chiral metallic nanotubes by applying an additional magnetic field. In particular, it is possible to obtain helical modes at one of the two Dirac points only, while the other one remains gapped.
Jelena Klinovaja, Manuel J. Schmidt, Bernd Braunecker, and Daniel Loss, arXiv:1011.3630