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- W1825654222 abstract "The Cu-doped insulator Bi$_2$Se$_3$ has recently been found to undergo a superconducting transition upon cooling, raising the possibilities that it is the first known topological superconductor or realizes a novel non-Abelian superconducting state. Its true nature depends critically on the bulk and surface state band topology. We present the first photoemission spectroscopy results where by examining the band topology at many different copper doping values we discover that the topologically protected spin-helical surface states remain well protected and separate from bulk Dirac bands at the Fermi level where Copper pairing occurs in the optimally doped insulator. The addition of copper is found to result in nonlinear electron doping and strong renormalization of the surface states. These highly unusual observations strongly suggest that superconductivity on the surface of Cu$_x$Bi$_2$Se$_3$ cannot be of any conventional type in account of the general theory. Characteristics of the three dimensional bulk Dirac band structure are reported for the first time with respect to the superconducting doping state and invariant properties which should help formulate a specific theory for this novel superconductor." @default.
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- W1825654222 date "2009-12-17" @default.
- W1825654222 modified "2023-10-16" @default.
- W1825654222 title "Observation of unconventional band topology in a superconducting doped topological insulator, Cux-Bi2Se3: Topological Superconductor or non-Abelian superconductor?" @default.
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