title: Possible electric-field-induced superconducting states in doped silicene.
abstract: Silicene has been synthesized recently, with experimental evidence showing possible superconductivity in the doped case. The noncoplanar low-buckled structure of this material inspires us to study the pairing symmetry of the doped system under a perpendicular external electric field. Our study reveals that the electric field induces an interesting quantum phase transition from the singlet chiral d + id'-wave superconducting phase to the triplet f-wave one. The emergence of the f-wave pairing results from the sublattice-symmetry-breaking caused by the electric field and the ferromagnetic-like intra-sublattice spin correlations at low dopings. Due to the enhanced density of states, the superconducting critical temperature of the system is enhanced by the electric field remarkably. Furthermore, we design a particular dc SQUID experiment to detect the quantum phase transition predicted here. Our results, if confirmed, will inject a new vitality to the familiar Si-based industry through adopting doped silicene as a tunable platform to study different types of exotic unconventional superconductivities.
authors: School of Physics, Beijing Institute of Technology, Beijing 100081, China.
authors: Li-Da
authors: LD
authors: Zhang
authors: School of Physics, Beijing Institute of Technology, Beijing 100081, China.
authors: Fan
authors: F
authors: Yang
authors: School of Physics, Beijing Institute of Technology, Beijing 100081, China.
authors: Yugui
authors: Y
authors: Yao
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