### 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 |

卷 | 1 |

發行號 | 2 |

DOIs | |

出版狀態 | Published - 2017 七月 12 |

### 指紋

### All Science Journal Classification (ASJC) codes

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

### 引用此文

*Physical Review Materials*,

*1*(2), [021201]. https://doi.org/10.1103/PhysRevMaterials.1.021201

}

*Physical Review Materials*, 卷 1, 編號 2, 021201. https://doi.org/10.1103/PhysRevMaterials.1.021201

**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.

研究成果: Article

TY - JOUR

T1 - Prediction of nontrivial band topology and superconductivity in M g2Pb

AU - Bian, Guang

AU - Chang, Tay Rong

AU - Huang, Angus

AU - Li, Yuwei

AU - Jeng, Horng Tay

AU - Singh, David J.

AU - Cava, Robert J.

AU - Xie, Weiwei

PY - 2017/7/12

Y1 - 2017/7/12

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85059517874&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85059517874&partnerID=8YFLogxK

U2 - 10.1103/PhysRevMaterials.1.021201

DO - 10.1103/PhysRevMaterials.1.021201

M3 - Article

AN - SCOPUS:85059517874

VL - 1

JO - Physical Review Materials

JF - Physical Review Materials

SN - 2475-9953

IS - 2

M1 - 021201

ER -