Meng L-B, Zhou M J, Zhang Y J, Ni S
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, People's Republic of China.
J Phys Condens Matter. 2019 Aug 28;31(34):345401. doi: 10.1088/1361-648X/ab21eb. Epub 2019 May 16.
The research of new superconductors is an ongoing field for the fundamental significances and potential applications, and two-dimensional (2D) nanomaterials open a new alluring branch for exploration. Here we predict by first-principles calculations that 2D pristine graphene-like BSi monolayer is a phonon-mediated superconductor above the boiling point of liquid helium. The intrinsic covalent-metallic ground state, large density of states at Fermi energy, proper electronic organization as well as strong coupling of out-of-plane phonons and electrons endow an intermediate electron-phonon coupling of ~1.12, rendering this honeycomb sheet as a conventional superconductor with a relatively high T ~ 11 K. As the global minimum structure in the 2D space previously predicted, this superconducting BSi monolayer may be feasible experimentally. Our finding provides a new field of superconducting nanomaterials for study.
新型超导体的研究因其重要的基础意义和潜在应用而成为一个不断发展的领域，二维（2D）纳米材料为其开辟了一个新的诱人探索分支。在此，我们通过第一性原理计算预测，二维原始类石墨烯BSi单层在液氦沸点以上是一种声子介导的超导体。其固有的共价 - 金属基态、费米能处的大态密度、恰当的电子结构以及面外声子与电子的强耦合赋予了约1.12的中等电子 - 声子耦合，使这种蜂窝状薄片成为具有相对较高转变温度Tc ~ 11 K的常规超导体。作为先前预测的二维空间中的全局最小结构，这种超导BSi单层在实验上可能是可行的。我们的发现为超导纳米材料的研究提供了一个新领域。
