Topological phase transitions driven by next-nearest-neighbor hopping in noncentrosymmetric cold Fermi gases

被引：0

作者：

王瑞 ^{[1
,2
]}

张存喜 ^{[1
]}

计青山 ^{[1
]}

机构：

[1] Department of Electronic Information Science and Engineering,Zhejiang Ocean University

[2] National Laboratory of Solid State Microstructures and Department of Physics,Nanjing University

来源：

Chinese Physics B | 2015年 / 03期

基金：

中国国家自然科学基金;

关键词：

topological phase transition; Fermi gases; Majorana fermion;

D O I：

暂无

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We investigate the topological phase marked by the Thouless–Kohmoto–Nightingale–Nijs(TKNN) number and the phase transitions driven by the next nearest neighbor(NNN) hopping in noncentrosymmetric cold Fermi gases, both spinsinglet pairing and spin-triplet pairing are considered. There exists a critical t’c for the NNN hopping, at which the quantum phase transition occurs, and the system changes from an Abelian(non-Abelian) phase to a non-Abelian(Abelian) one. By numerically diagonalizing the Hamiltonian in the real space, the energy spectra with edge states for different topological phases and the Majorana zero modes are discussed. Although the spin-triplet pairing does not contribute to the gap closing and the phase diagram, it induces gapless states in the presence of a magnetic field, and the TKNN number in this region is still zero.

引用

页码：70 / 75

页数：6