Kobayashi Shingo, Sato Masatoshi
Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan.
Phys Rev Lett. 2015 Oct 30;115(18):187001. doi: 10.1103/PhysRevLett.115.187001. Epub 2015 Oct 29.
Dirac semimetals host bulk band-touching Dirac points and a surface Fermi loop. We develop a theory of superconducting Dirac semimetals. Establishing a relation between the Dirac points and the surface Fermi loop, we clarify how the nontrivial topology of Dirac semimetals affects their superconducting state. We note that the unique orbital texture of Dirac points and a structural phase transition of the crystal favor symmetry-protected topological superconductivity with a quartet of surface Majorana fermions. We suggest the possible application of our theory to recently discovered superconducting states in Cd_{3}As_{2}.
狄拉克半金属具有体能带接触狄拉克点和表面费米环。我们发展了一种超导狄拉克半金属理论。通过建立狄拉克点与表面费米环之间的关系，我们阐明了狄拉克半金属的非平凡拓扑结构如何影响其超导态。我们注意到狄拉克点独特的轨道纹理和晶体的结构相变有利于具有四重表面马约拉纳费米子的对称性保护拓扑超导。我们建议将我们的理论应用于最近在Cd₃As₂中发现的超导态。
