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

共 49 条

[41] Topological insulators and superconductors: tenfold way and dimensional hierarchy [J].

Ryu, Shinsei ;

Schnyder, Andreas P. ;

Furusaki, Akira ;

Ludwig, Andreas W. W. .

NEW JOURNAL OF PHYSICS, 2010, 12

[42] Topological phases of noncentrosymmetric superconductors: Edge states, Majorana fermions, and non-Abelian statistics [J].

Sato, Masatoshi ;

Fujimoto, Satoshi .

PHYSICAL REVIEW B, 2009, 79 (09)

[43]

Sau J. D., ARXIV11115622

[44] Majorana fermions in strongly interacting helical liquids [J].

Sela, Eran ;

Altland, Alexander ;

Rosch, Achim .

PHYSICAL REVIEW B, 2011, 84 (08)

[45] Interaction effects in topological superconducting wires supporting Majorana fermions [J].

Stoudenmire, E. M. ;

Alicea, Jason ;

Starykh, Oleg A. ;

Fisher, Matthew P. A. .

PHYSICAL REVIEW B, 2011, 84 (01)

[46] Quantized adiabatic charge transport in a carbon nanotube [J].

Talyanskii, VI ;

Novikov, DS ;

Simons, BD ;

Levitov, LS .

PHYSICAL REVIEW LETTERS, 2001, 87 (27) :276802-276802

[47] Engineering a Robust Quantum Spin Hall State in Graphene via Adatom Deposition [J].

Weeks, Conan ;

Hu, Jun ;

Alicea, Jason ;

Franz, Marcel ;

Wu, Ruqian .

PHYSICAL REVIEW X, 2011, 1 (02) :1-15

[48] Spin-orbit effects in carbon-nanotube double quantum dots [J].

Weiss, S. ;

Rashba, E. I. ;

Kuemmeth, F. ;

Churchill, H. O. H. ;

Flensberg, K. .

PHYSICAL REVIEW B, 2010, 82 (16)

[49] Carbon nanotube intramolecular junctions [J].

Yao, Z ;

Postma, HWC ;

Balents, L ;

Dekker, C .

NATURE, 1999, 402 (6759) :273-276

← 1 2 3 4 5 →