Three-Gap High-<i>T</i><sub>c</sub> Topological Superconductivity in Lithium-Doped Bilayer Borophenes.
basic_science · Level V
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- Record sourced from PubMed, PMID 41185153.
- Also identified by DOI 10.1021/acs.nanolett.5c04620.
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Abstract
Realizing topological superconductors (TSCs) with high transition temperatures (high-<i>T</i><sub>c</sub>) remains a central challenge in the development of fault-tolerant quantum computation. Here, we propose a route for realizing high-<i>T</i><sub>c</sub> TSCs by integrating multigap superconductivity with nontrivial band topology in lithium-doped bilayer borophene. Extensive structural searches and high-throughput screening of over 4000 Li<sub>1-<i>x</i></sub>B<sub><i>x</i></sub> nanosheets identify eight promising multigap TSC candidates. Among them, the LiB<sub>12</sub> nanosheet is identified as a prototypical three-gap superconductor and simultaneously a topological metal with a symmetry-protected Dirac nodal loop. Fully anisotropic Migdal-Eliashberg calculations reveal cooperative couplings between σ↔in-plane and π↔out-of-plane phonon, which markedly enhance electron-phonon interactions and drive a high-<i>T</i><sub>c</sub> of 57 K. These findings underscore the potential of metal-doped bilayer borophenes as a cutting-edge material platform for achieving high-<i>T</i><sub>c</sub> multigap TSCs.