Atomic manipulation of in-gap states in the beta-Bi2Pd superconductor

Article

关键词: SINGLE ATOMS;    BOUND-STATES;    MOLECULES;    IMPURITY;    CHAINS;   

DOI  :  10.1103/PhysRevB.104.045406

来源: SCIE

【 摘 要 】

Electronic states in the gap of a superconductor inherit intriguing many-body properties from the superconductor. Here, we create these in-gap states by manipulating Cr atomic chains on the beta-Bi2Pd superconductor. We find that the topological properties of the in-gap states can greatly vary depending on the crafted spin chain. These systems make an ideal platform for nontrivial topological phases because of the large atom-superconductor interactions and the existence of a large Rashba coupling at the Bi-terminated surface. We study two spin chains, one with atoms two lattice parameters apart and one with root 2. lattice parameters. Of these, only the second one is in a topologically nontrivial phase, in agreement with the spin interactions for this geometry.

【 授权许可】

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