Strain manipulation of Majorana fermions in graphene armchair nanoribbons

Article

关键词: BIAS CONDUCTANCE PEAK;    TOPOLOGICAL SUPERCONDUCTOR;    ZERO MODES;    NANOWIRE;    SIGNATURE;   

DOI  :  10.1103/PhysRevB.97.041414

来源: SCIE

【 摘 要 】

Graphene nanoribbons with armchair edges are studied for externally enhanced but realistic parameter values: enhanced Rashba spin-orbit coupling due to proximity to a transition-metal dichalcogenide, such as WS2, and enhanced Zeeman field due to exchange coupling with a magnetic insulator, such as EuS under an applied magnetic field. The presence of s-wave superconductivity, induced either by proximity or by decoration with alkali-metal atoms, such as Ca or Li, leads to a topological superconducting phase with Majorana end modes. The topological phase is highly sensitive to the application of uniaxial strain with a transition to the trivial state above a critical strain well below 0.1%. This sensitivity allows for real-space manipulation of Majorana fermions by applying nonuniform strain profiles. Similar manipulation is also possible by applying an inhomogeneous Zeeman field or chemical potential.

【 授权许可】

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