Topological nodal line and superconductivity of highly thermally stable two-dimensional TiB4
Lei Wang, Mingfeng Liu, Jiangxu Li, Ronghan Li, Hui Ma, Xing-Qiu Chen
DOI 10.1103/PhysRevB.104.195123 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
By means of first-principles calculations, we study the electronic structures, lattice dynamics, electron-phonon coupling (EPC), and superconductivity of TiB4 monolayer (TBML) and TiB4 bilayer (TBBL). We find that both TBML and TBBL are nodal line semimetals, and the occurrences of their nodal lines are mainly due to the band inversions between B-px+py and B-pz for TBML and between Ti-dxz+dyz and Ti-dz2 for TBBL. The distortion of Ti atoms in the TBBL induces a horizontal glide mirror plane, which protects its nodal line against the spin-orbit coupling. The computed EPC constant λ of TBML is 0.65, higher than that of the TBBL with λ=0.35. Both TBML and TBBL are identified to be phonon-mediated two-dimensional (2D) superconductors with the calculated Tc=1.66K and 0.82 K, respectively. The Tc of the TBBL can be further enhanced to 6.43 K by applying a tensile strain of 11%. Moreover, they exhibit excellent thermal stability. The coexistence of the topological nodal-line states around the Fermi level and superconductivity in the square-lattice TiB4 monolayer may show more potential for realization of exotic physics.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| TiB4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.66 | Pressure not reported | unknown |
| TiB4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.82 | Pressure not reported | unknown |
| TiB4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.43 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure unresolved | unknown |
| AlB6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.7 | Pressure not reported | unknown |
| TiB2H Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | unknown |
Similar papers
Multiband s-wave topological superconductors: Role of dimensionality and magnetic field response
similarity 0.95Shusa Deng et al.
Source status unknown — claims are unverified
Electronic structure of superconducting MgB2 and related binary and ternary borides
similarity 0.95N. I. Medvedeva et al.
Source status unknown — claims are unverified
Electronic and dynamical properties of the MgB2 surface: Implications for the superconducting properties
similarity 0.95G. Profeta et al.
Source status unknown — claims are unverified
Anisotropic superconductivity in metal-intercalated layered borocarbides induced by σ electrons coupling with soft phonon modes
similarity 0.95Haoqi Chen et al.
Source status unknown — claims are unverified
Two-band superconductivity in doped SrTiO3 films and interfaces
similarity 0.95R. M. Fernandes et al.
Source status unknown — claims are unverified
Anisotropic Superconducting Properties of Aligned MgB2 Crystallites
similarity 0.94O. F. de Lima et al.
Source status unknown — claims are unverified