Kavli Affiliate: Ke Wang
| First 5 Authors: Hemian Yi, Yi-Fan Zhao, Ying-Ting Chan, Jiaqi Cai, Ruobing Mei
| Summary:
When two different electronic materials are brought together, the resultant
interface often shows unexpected quantum phenomena, including interfacial
superconductivity and Fu-Kane topological superconductivity (TSC). Here, we use
molecular beam epitaxy (MBE) to synthesize heterostructures formed by stacking
together two magnetic materials, a ferromagnetic topological insulator (TI) and
an antiferromagnetic iron chalcogenide (FeTe). We discover emergent
interface-induced superconductivity in these heterostructures and demonstrate
the trifecta occurrence of superconductivity, ferromagnetism, and topological
band structure in the magnetic TI layer, the three essential ingredients of
chiral TSC. The unusual coexistence of ferromagnetism and superconductivity can
be attributed to the high upper critical magnetic field that exceeds the Pauli
paramagnetic limit for conventional superconductors at low temperatures. The
magnetic TI/FeTe heterostructures with robust superconductivity and atomically
sharp interfaces provide an ideal wafer-scale platform for the exploration of
chiral TSC and Majorana physics, constituting an important step toward scalable
topological quantum computation.
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