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

被引：37

作者：

Egger, Reinhold ^{[1
]}

Flensberg, Karsten ^{[2
]}

机构：

[1] Univ Dusseldorf, Inst Theoret Phys, D-40225 Dusseldorf, Germany

[2] Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark

来源：

PHYSICAL REVIEW B | 2012年 / 85卷 / 23期

关键词：

TRANSPORT-PROPERTIES; SPIN; JUNCTIONS; DEVICES;

D O I：

10.1103/PhysRevB.85.235462

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the low-energy band structure of armchair and small-band-gap 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 small-band-gap semiconducting tube with the field in the same plane, a nondegenerate zero mode at momentum k = 0 can be induced, allowing for the generation of topologically protected Majorana fermion end states.

引用

页数：6

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