TY - JOUR
T1 - Intrinsic and doping-enhanced superconductivity in monolayer 1H-TaS2
T2 - Critical role of charge ordering and spin-orbit coupling
AU - Lian, Chao Sheng
AU - Heil, Christoph
AU - Liu, Xiaoyu
AU - Si, Chen
AU - Giustino, Feliciano
AU - Duan, Wenhui
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (Grants No. 11904325, No. 11874079, and No. 51788104), the Ministry of Science and Technology of China (Grant No. 2016YFA0301001), and the National Supercomputing Center in Zhengzhou. C.H. and F.G. acknowledge support by the Austrian Science Fund (FWF) Project No. P 32144-N36 and the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) under Award No. DE-SC0020129, respectively.
Publisher Copyright:
© 2022 American Physical Society.
PY - 2022/5/1
Y1 - 2022/5/1
N2 - The interplay of superconductivity with charge density wave (CDW) in metallic transition-metal dichalcogenides has been widely debated, and viable strategies manipulating these quantum states in the two-dimensional (2D) limit remain unclear. Using the ab initio anisotropic Migdal-Eliashberg theory, we successfully explain the superconductivity observed in monolayer 1H-TaS2 by simultaneously determining its precise CDW structure and treating the marked modification of electron-phonon interaction and critical temperature Tc by spin-orbit coupling effects. With this paradigm, we further show that electron doping weakens the CDW order leading to increased Tc up to 11 K, along with a single-gap to two-gap superconductivity transition due to the suppression of the CDW gap. By contrast, a low hole doping barely affects the CDW but still yields a significantly enhanced superconducting order, implying their good coexistence. Combined with the synergistic behavior of CDW and superconductivity, which cooperate upon TaS2 thickness reduction causing an unusual rise of Tc, our results unravel diversified interactions between the two collective orders in ultrathin TaS2, being competition, coexistence or cooperation depending on external stimuli, which provide key clues for controlling correlated states in devices based on 2D CDW superconductors.
AB - The interplay of superconductivity with charge density wave (CDW) in metallic transition-metal dichalcogenides has been widely debated, and viable strategies manipulating these quantum states in the two-dimensional (2D) limit remain unclear. Using the ab initio anisotropic Migdal-Eliashberg theory, we successfully explain the superconductivity observed in monolayer 1H-TaS2 by simultaneously determining its precise CDW structure and treating the marked modification of electron-phonon interaction and critical temperature Tc by spin-orbit coupling effects. With this paradigm, we further show that electron doping weakens the CDW order leading to increased Tc up to 11 K, along with a single-gap to two-gap superconductivity transition due to the suppression of the CDW gap. By contrast, a low hole doping barely affects the CDW but still yields a significantly enhanced superconducting order, implying their good coexistence. Combined with the synergistic behavior of CDW and superconductivity, which cooperate upon TaS2 thickness reduction causing an unusual rise of Tc, our results unravel diversified interactions between the two collective orders in ultrathin TaS2, being competition, coexistence or cooperation depending on external stimuli, which provide key clues for controlling correlated states in devices based on 2D CDW superconductors.
UR - http://www.scopus.com/inward/record.url?scp=85131359041&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.105.L180505
DO - 10.1103/PhysRevB.105.L180505
M3 - Article
AN - SCOPUS:85131359041
SN - 2469-9950
VL - 105
JO - Physical Review B
JF - Physical Review B
IS - 18
M1 - L180415
ER -