期刊
ACS NANO
卷 12, 期 12, 页码 12665-12672出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b07550
关键词
topological superconductivity; Majorana Fermions; proximity effect; topological insulator; 2D superconductor; van der Waals heterostructure
类别
资金
- MHRD, Govt. of India
- KVPY, Govt. of India
- Nanomission, Department of Science and Technology, Govt. of India
The combination of superconductivity and spin-momentum locking at the interface between an s-wave superconductor and a three-dimensional topological insulator (3D-TI) is predicted to generate exotic p-wave topological superconducting phases that can host Majorana Fermions. However, large bulk conductivities of previously investigated 3D-TI samples and Fermi level mismatches between 3D bulk superconductors and 2D topological surface states have thwarted significant progress. Here, we employ bulk-insulating topological insulators in proximity with two-dimensional superconductor NbSe2 assembled via van der Waals epitaxy. Experimentally measured differential conductance yields unusual features including a double-gap spectrum, an intrinsic asymmetry that vanishes with small in-plane magnetic fields, differential conductance ripples at biases significantly larger than the superconducting gap. We explain our results on the basis of proximity-induced superconductivity of topological surface states, while also considering possibilities of topologically trivial superconductivity arising from Rashba-type surface states. Our work demonstrates the possibility of obtaining p-wave superconductors by proximity effects on bulk-insulating TIs.
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