arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1506.02584cond-mat.supr-con
收藏

掺杂相关量子自旋霍尔绝缘体d_{x^2-y^2} + i d_{xy}波拓扑超导中的螺旋Majorana费米子

Helical Majorana fermions in d_{x^2-y^2} + i d_{xy}-wave topological superconductivity of doped correlated quantum spin Hall insulators

Shih-Jye Sun, Chung-Hou Chung, Yung-Yeh Chang, Wei-Feng Tsai, Fu-Chun Zhang

摘要:

利用重整化平均场论研究了锯齿形带状蜂窝晶格Kane-Mele模型的大Hubbard U极限。基态表现出时间反演对称性(TRS)破缺d + i d '波超导电性。在大自旋轨道耦合下,纯Kane-Mele模型中具有非平凡自旋Chern数的Z2相在TRS破缺态(称为自旋Chern相)中持续存在,并且在边缘处具有两对反向传播的螺旋Majorana模.随着自旋-轨道耦合的降低,系统经历了从自旋-陈到手征超导态的拓扑量子相变。我们的研究结果可能的相关性adatom掺杂的石墨烯和irridate化合物进行了讨论。

英文摘要:

Large Hubbard U limit of the Kane-Mele model on a zigzag ribbon of honeycomb lattice near half-filling is studied via a renormalized mean-field theory. The ground state exhibits time-reversal symmetry (TRS) breaking d + i d'-wave superconductivity. At large spin-orbit coupling, the Z2 phase with non-trivial spin Chern number in the pure Kane-Mele model is persistent into the TRS broken state (called spin-Chern phase), and has two pairs of counter-propagating helical Majorana modes at the edges. As the spin-orbit coupling is reduced, the system undergoes a topological quantum phase transition from the spin-Chern to chiral superconducting states. Possible relevance of our results to adatom-doped graphene and irridate compounds is discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑