Prediction of nontrivial band topology and superconductivity in M g2Pb

Guang Bian, Tay Rong Chang, Angus Huang, Yuwei Li, Horng Tay Jeng, David J. Singh, Robert J. Cava, Weiwei Xie

研究成果: Article同行評審

7 引文 斯高帕斯(Scopus)

摘要

The interplay of BCS superconductivity and nontrivial band topology is expected to give rise to opportunities for creating topological superconductors, achieved through pairing spin-filtered boundary modes via superconducting proximity effects. The thus-engineered topological superconductivity can, for example, facilitate the search for Majorana fermion quasiparticles in condensed matter systems. Here we report a first-principles study of Mg2Pb and predict that it should be a superconducting topological material. The band topology of Mg2Pb is identical to that of the archetypal quantum spin Hall insulator HgTe, while isostructural and isoelectronic Mg2Sn is topologically trivial; a trivial-to-topological transition is predicted for Mg2Sn1-xPbx for x≈0.77. We propose that Mg2Pb-Mg2Sn quantum wells should generate robust spin-filtered edge currents in analogy to HgTe/CdTe quantum wells. In addition, our calculations predict that Mg2Pb should become superconducting upon electron doping. Therefore, Mg2Pb is expected to provide a practical material platform for studying emergent phenomena arising from the interplay of superconductivity and band topology.

原文English
文章編號021201
期刊Physical Review Materials
1
發行號2
DOIs
出版狀態Published - 2017 七月 12

All Science Journal Classification (ASJC) codes

  • 材料科學(全部)
  • 物理與天文學(雜項)

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