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

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number021201
JournalPhysical Review Materials
Volume1
Issue number2
DOIs
Publication statusPublished - 2017 Jul 12

Fingerprint

Superconductivity
superconductivity
topology
Topology
Semiconductor quantum wells
Superconducting materials
predictions
quantum wells
Fermions
platforms
fermions
Doping (additives)
insulators
Electrons
electrons

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

Cite this

Bian, Guang ; Chang, Tay-Rong ; Huang, Angus ; Li, Yuwei ; Jeng, Horng Tay ; Singh, David J. ; Cava, Robert J. ; Xie, Weiwei. / Prediction of nontrivial band topology and superconductivity in M g2Pb. In: Physical Review Materials. 2017 ; Vol. 1, No. 2.
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Prediction of nontrivial band topology and superconductivity in M g2Pb. / Bian, Guang; Chang, Tay-Rong; Huang, Angus; Li, Yuwei; Jeng, Horng Tay; Singh, David J.; Cava, Robert J.; Xie, Weiwei.

In: Physical Review Materials, Vol. 1, No. 2, 021201, 12.07.2017.

Research output: Contribution to journalArticle

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