Spin-orbit coupled fermions in ladderlike optical lattices at half filling

Article

关键词: INSULATING PHASES;    MOTT INSULATOR;    QUANTUM;    ATOMS;   

DOI  :  10.1103/PhysRevB.88.165101

来源: SCIE

【 摘 要 】

We study the ground-state phase diagram of two-component fermions loaded in a ladderlike lattice at half filling in the presence of spin-orbit coupling. For repulsive fermions with unidirectional spin-orbit coupling along the legs we identify a Neel state which is separated from rung-singlet and ferromagnetic states by Ising phase transition lines. These lines cross for maximal spin-orbit coupling and a direct Gaussian phase transition between rung-singlet and ferro phases is realized. For the case of Rashba-like spin-orbit coupling, besides the rung-singlet phases two distinct striped ferromagnetic phases are formed. In the case of attractive fermions with spin-orbit coupling at half filling for decoupled chains we identify a dimerized state that separates a singlet superconductor and a ferromagnetic state.

【 授权许可】

Free