The Fulde-Ferrell-Larkin-Ovchinnikov states in s and d-wave superconductor with spin-dependent bandwidth imbalance on square lattice  

作　　者：Yong-Hui Wang Qing-Qiang Meng Yan Chen 

机构地区：[1]Department of Physics and State Key Laboratory of Surface Physics,Fudan University,Shanghai 200433,China [2]Collaborative Innovation Center of Advanced Microstructures,Nanjing 210093,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2016年第1期92-97,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Key Basic Research Program of China(Grant No.2012CB921604);the National Natural Science Foundation of China(Grant Nos.11274069 and 11474064)

摘　　要：We study numerically the phase diagram for s and d-wave fermionic superftuidity/superconductivity with spin-dependent band- width imbalance on a two-dimensional square-lattice. We also investigate the spontaneous space symmetry breaking states at low temperatures by solving the Bogoliubov-de Gennes equations. It is found that, the spatial configuration of the order parameter, both the uni-directional Fulde-Ferrell-Larkin-Ovchinnikov （FFLO） states and the two-dimensional FFLO state may show up in the presence of finite spin-dependent bandwidth imbalance. Moreover, we calculate the spectra of local density of states, and the experimental proposals of observing such FFLO states are therefore suggested.We study numerically the phase diagram for s and d-wave fermionic superfluidity/superconductivity with spin-dependent bandwidth imbalance on a two-dimensional square-lattice. We also investigate the spontaneous space symmetry breaking states at low temperatures by solving the Bogoliubov-de Gennes equations. It is found that, the spatial configuration of the order parameter,both the uni-directional Fulde-Ferrell-Larkin-Ovchinnikov(FFLO) states and the two-dimensional FFLO state may show up in the presence of finite spin-dependent bandwidth imbalance. Moreover, we calculate the spectra of local density of states, and the experimental proposals of observing such FFLO states are therefore suggested.

关 键 词：FFLO state SUPERCONDUCTIVITY SUPERFLUIDITY 

分 类 号：TM26[一般工业技术—材料科学与工程]