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arXiv · 1309.7347

Possible Electric-Field-Induced Superconducting States in Doped Silicene

Li-Da Zhang·Fan Yang·Yugui Yao
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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.

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Li-Da Zhang, Fan Yang, Yugui Yao. 2013-09-27. Possible Electric-Field-Induced Superconducting States in Doped Silicene. https://arxiv.org/abs/1309.7347

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