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Theoretical prediction of superconductivity in monolayer h-BN doped with alkaline-earth metals (Ca, Sr, Ba) | | Nao. H. Shimada
; Emi Minamitani
; Satoshi Watanabe
; | | Date: |
10 Apr 2020 | | Abstract: | We investigated the possibility of superconductivity in monolayer hexagonal
boron nitride (h-BN) doped using each group-1 (Li, Na, K) and group-2 (Be, Mg,
Ca, Sr, Ba) atom via ab-initio calculations. Consequently, we reveal that Sr-
and Ba-doped monolayer h-BN and Ca-doped monolayer h-BN with 3.5% tensile
strain are energetically stable and become superconductors with Tc values of
5.83 K, 1.53 K, and 12.8 K, respectively, which are considerably higher than
those of Ca-, Sr-, and Ba-doped graphene. In addition, the momentum-resolved
electron-phonon coupling (EPC) constant shows that the scattering among
intrinsic {pi} electrons around the {Gamma} point dominates Tc. The
scattering process is mediated by the low-energy vibration of the adsorbate.
Moreover, compared with graphene, the stronger adsorbate-substrate interaction
and lower symmetry in h-BN are critical for enhancing EPC in doped h-BN. | | Source: | arXiv, 2004.4891 | | Services: | Forum | Review | PDF | Favorites | |
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