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Chin. Phys. B, 2016, Vol. 25(7): 077305    DOI: 10.1088/1674-1056/25/7/077305
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Topological phase in one-dimensional Rashba wire

Sa-Ke Wang(汪萨克)1, Jun Wang(汪军)1, Jun-Feng Liu(刘军丰)2
1 Department of Physics, Southeast University, Nanjing 210096, China;
2 Department of Physics, South University of Science and Technology of China, Shenzhen 518055, China
Abstract  

We study the possible topological phase in a one-dimensional (1D) quantum wire with an oscillating Rashba spin-orbital coupling in real space. It is shown that there are a pair of particle-hole symmetric gaps forming in the bulk energy band and fractional boundary states residing in the gap when the system has an inversion symmetry. These states are topologically nontrivial and can be characterized by a quantized Berry phase ±π or nonzero Chern number through dimensional extension. When the Rashba spin-orbital coupling varies slowly with time, the system can pump out 2 charges in a pumping cycle because of the spin flip effect. This quantized pumping is protected by topology and is robust against moderate disorders as long as the disorder strength does not exceed the opened energy gap.

Keywords:  one-dimensional topological phase      Rashba spin-orbit interaction      spatial modulation      quantized pump  
Received:  10 December 2015      Revised:  25 March 2016      Published:  05 July 2016
PACS:  73.43.-f (Quantum Hall effects)  
  73.20.-r (Electron states at surfaces and interfaces)  
  72.25.-b (Spin polarized transport)  
Fund: 

Project supported by the National Natural Science Foundation of China (Grant Nos. 115074045 and 11204187) and the Natural Science Foundation of Jiangsu Province, China (Grant No. BK20131284).

Corresponding Authors:  Jun Wang     E-mail:  jwang@seu.edu.cn

Cite this article: 

Sa-Ke Wang(汪萨克), Jun Wang(汪军), Jun-Feng Liu(刘军丰) Topological phase in one-dimensional Rashba wire 2016 Chin. Phys. B 25 077305

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