Tuesday, March 27, 2012

1203.5618 (Reinhold Egger et al.)

Emerging Dirac and Majorana fermions for carbon nanotubes with
proximity-induced pairing and spiral magnetic field
   [PDF]

Reinhold Egger, Karsten Flensberg
We study the low-energy bandstructure of armchair and small-bandgap semiconducting carbon nanotubes with proximity-induced superconducting pairing when a spiral magnetic field creates strong effective spin-orbit interactions from the Zeeman term and a periodic potential from the orbital part. We find that gapless Dirac fermions can be generated by variation of a single parameter. For a semiconducting tube with the field in the same plane, a non-degenerate zero mode at momentum k=0 can be induced, allowing for the generation of topologically protected Majorana fermion end states.
View original: http://arxiv.org/abs/1203.5618

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