High Transition Temperature Driven by Type-II Dirac Fermions in Topological Superconductor B<sub>7</sub>Be<sub>2</sub>B<sub>7</sub> Nanosheet.
basic_science · Level V
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- Record sourced from PubMed, PMID 39283029.
- Also identified by DOI 10.1021/acs.nanolett.4c02497.
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Abstract
Topological superconductors (TSCs) offer a promising avenue for delving into exotic states of matter and fundamental physics. We propose a strategy for realizing high transition temperatures (high-<i>T</i><sub>c</sub>) in TSCs by leveraging nontrivial topology alongside a high carrier density near the Fermi level in metal-doped borophenes. We identified 39 candidates with exceptional thermodynamic stability from thousands of Be-intercalated borophenes (Be<sub>1-<i>x</i></sub>B<sub><i>x</i></sub>) via extensive structural searches. Seven candidates exhibit high carrier densities, with B<sub>7</sub>Be<sub>2</sub>B<sub>7</sub> emerging as a particularly promising candidate. This nanosheet displays both type-I and type-II Dirac fermions, indicative of <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mrow><mi>Z</mi></mrow><mrow><mn>2</mn></mrow></msub></math> topological metals, thereby positioning it as an ideal platform for high-<i>T</i><sub>c</sub> TSCs. The high-density π electrons of B<sub>7</sub>Be<sub>2</sub>B<sub>7</sub> originating from type-II Dirac fermions, coupled with the out-of-plane vibrations of B and Be atoms, significantly enhance the electron-phonon coupling (λ = 1.42), resulting in a substantially high-<i>T</i><sub>c</sub> of 31.5 K. These findings underscore the potential of metal-doped borophenes as a cutting-edge material platform for achieving high-<i>T</i><sub>c</sub> TSCs.