Details

Autor(en) / Beteiligte

• Yan, Luo
• Liu, Peng-Fei
• Bo, Tao
• Zhang, Junrong
• Tang, Ming-Hua
• Xiao, Yong-Guang
• Wang, Bao-Tian

Titel

Emergence of superconductivity in a Dirac nodal-line CuSi monolayer: calculations

Ist Teil von

• Journal of materials chemistry. C, Materials for optical and electronic devices, 2019-09, Vol.7 (35), p.1926-1932

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Following the prediction given by first-principles simulations [ J. Am. Chem. Soc. 137 , 2757 (2015)], a Dirac nodal-line Cu 2 Si monolayer has been successfully synthesized on a Cu(111) surface [ Nat. Commun. 8 , 1007 (2017)] or on a Si(111) substrate [ Phys. Rev. Mater. 3 , 044004 (2019)]. However, its superconducting properties have never been reported in experiments or theory. Here, through first-principles calculations, we study its electron and phonon properties and electron-phonon coupling to investigate the possibility of superconductivity for a metallic Cu 2 Si monolayer. The results show that it is an intrinsic BCS-type superconductor, with the estimated superconducting temperature T c being ∼4.1 K. We further find that the Fermi surface nesting is partially responsible for its superconducting character. Carrier doping as well as biaxial strains will suppress the T c . Our results help to explain the challenges to experimentally probe superconductivity in substrate-supported Cu 2 Si monolayers and provide clues for further experiments. We demonstrate that the recent experimentally synthesized Cu 2 Si monolayer is a BCS-type two-dimensional superconductor with T c being ∼ 4.1 K.