Superconductivity in clathrate LiLaB8 with nontrivial band topology
Superconductivity in clathrate LiLaB8 with nontrivial band topology
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具有非平凡能带拓扑的包合物 LiLaB8 的超导性
DOI:
10.1016/j.mtphys.2022.100817
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发表时间:
2022-08
影响因子:
11.5
通讯作者:
Yinwei Li
中科院分区:
文献类型:
--
作者:
Yinwei Liang;Xuanye Zhang;Meiling Xu;Gang Xu;Yinwei Li
Materials that exhibit both superconductivity and nontrivial topological electronic structures have attracted considerable attention due to the potential for the realization of novel quantum states. Here, using swarm-intelligence structure prediction methodology and first-principles calculations, we have predicted a ternary double-metal boron clathrate superconductor LiLaB8with topologically protected surface states. B atoms in LiLaB8polymerize into two kinds of caged structures, i.e. B12and B24cages, enclosing Li and La atoms, respectively. LiLaB8can be possibly synthesized at the pressure above 75 GPa and recovered to ambient conditions with B cages well preserved. Electron-phonon coupling calculations show that LiLaB8is a potential superconductor with an estimatedTcof 2.4 K at 100 GPa, which increases to 9.5 K at ambient pressure. The enhanced superconductivity is considered to originate from softened mode related to the vibrations of La and B atoms. Electronic band structure calculations showcase the apparent “band inversion” of La 5d and B 2p orbitals. Z2invariant and topologically protected surface states demonstrate that LiLaB8is indeed a nontrivial-topological material. These results indicate LiLaB8is a superconductor with nontrivial band topology that helps in the study of fascinating phenomena arising from the interplay of and superconductivity and band topology.
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