Feng Liu, Cheng-Cheng Liu, Kehui Wu, Fan Yang, Yugui Yao
We investigate the structure and physical properties of the undoped bilayer silicene (BLS). Our first principle (FP) calculations reveal that the band structure of the system with D3d symmetry is intrinsically metallic with pocket Fermi surfaces around each K point, which opens the door to formation of a superconducting state. Our further study based on random phase approximation (RPA) identifies the system as a chiral d+id0 superconductor, mediated by the strong spin fluctuation on border of the antiferromagnetic spin density wave (SDW) order. Tunable Fermi pocket area via strain enables high superconducting critical temperature, which emerges when the SDW critical interaction strength is tuned near that of the real interaction. Our discovery not only sheds light upon the realization of the long-sought chiral d+id0 superconductivity (SC), but will also bring the exotic unconventional SC into the familiar Si-industry.
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http://arxiv.org/abs/1208.5596
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