Berlin 2012 – scientific programme
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MA: Fachverband Magnetismus
MA 14: Joint Symposium "Topological Insulators: Influence of Superconductivity, Magnetism and Extrinsic Spin-Orbit Interaction" (SYTI)
MA 14.2: Invited Talk
Tuesday, March 27, 2012, 10:00–10:30, H 0105
Cooper Pairs in Topological Insulator Bi2Se3 Thin Films Induced by Proximity Effect — •Jinfeng Jia — Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
Three dimensional topological insulators (TIs), a new state of matter, have recently become a fertile farmland in which plenty of exotic quantum physical phenomena can grow. Among them, the interplay between topologically ordered states and symmetry-breaking states such as magnetism and superconductivity (SC) is particularly fascinating and has attracted extensive research activities. By introducing superconducting states into a TI via superconducting proximity effect, namely Cooper pairs tunneling into TI at TI/SC interface, the interplay between TI and SC can lead to the Majorana Fermion (MF) - quasiparticle that is its own antiparticle. MFs in solids obeys non-Abelian quantum statistics, are considered as the most promising candidate for fault-tolerant quantum computation. Here we report scanning tunneling microscopy observation of Cooper pairs formation on Bi2Se3 thin films grown on BCS type s-wave superconductor NbSe2 by molecular beam epitaxy technique. Our data show that the Cooper pairs persist in the thickness regime from one quintuple layer (QL) up to seven QL of Bi2Se3 where topological order forms. This observation lays the groundwork for experimentally realizing MFs in condensed matter physics.