Coexistence of Superconductivity with Enhanced Charge Density Wave Order in the Two-Dimensional Limit of TaSe2. Lian, C., Heil, C., Liu, X., Si, C., Giustino, F., & Duan, W. The Journal of Physical Chemistry Letters, 10(14):4076–4081, July, 2019. Publisher: American Chemical Society![Coexistence of Superconductivity with Enhanced Charge Density Wave Order in the Two-Dimensional Limit of TaSe2 [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Bulk 2H-TaSe2 is a model charge density wave (CDW) metal with superconductivity emerging at extremely low temperature (Tc = 0.1 K). Here, by first-principles calculations including the explicit calculation of the screened Coulomb interaction, we demonstrate enhanced superconductivity in the CDW state of monolayer 1H-TaSe2 observed in recent experiments. Its ground-state 3 × 3 CDW phase features triangular clustering of Ta atoms and possesses a large electron–phonon coupling of λ = 0.74, yielding an order of magnitude higher superconducting Tc compared to the bulk. Upon lowering the thickness from bulk to monolayer TaSe2, the CDW intensifies with slightly decreased Fermi-level density of states, while superconductivity gets boosted via a largely increased intrinsic electron–phonon coupling strength, which overcomes both the CDW effect and naturally reinforced Coulomb repulsion. These results uncover the simultaneously enhanced CDW and superconducting orders in the two-dimensional limit for the first time and have key implications for other CDW metals like 2H-TaS2.
@article{lian_coexistence_2019,
title = {Coexistence of {Superconductivity} with {Enhanced} {Charge} {Density} {Wave} {Order} in the {Two}-{Dimensional} {Limit} of {TaSe2}},
volume = {10},
url = {https://doi.org/10.1021/acs.jpclett.9b01480},
doi = {10.1021/acs.jpclett.9b01480},
abstract = {Bulk 2H-TaSe2 is a model charge density wave (CDW) metal with superconductivity emerging at extremely low temperature (Tc = 0.1 K). Here, by first-principles calculations including the explicit calculation of the screened Coulomb interaction, we demonstrate enhanced superconductivity in the CDW state of monolayer 1H-TaSe2 observed in recent experiments. Its ground-state 3 × 3 CDW phase features triangular clustering of Ta atoms and possesses a large electron–phonon coupling of λ = 0.74, yielding an order of magnitude higher superconducting Tc compared to the bulk. Upon lowering the thickness from bulk to monolayer TaSe2, the CDW intensifies with slightly decreased Fermi-level density of states, while superconductivity gets boosted via a largely increased intrinsic electron–phonon coupling strength, which overcomes both the CDW effect and naturally reinforced Coulomb repulsion. These results uncover the simultaneously enhanced CDW and superconducting orders in the two-dimensional limit for the first time and have key implications for other CDW metals like 2H-TaS2.},
number = {14},
urldate = {2024-01-18},
journal = {The Journal of Physical Chemistry Letters},
author = {Lian, Chao-Sheng and Heil, Christoph and Liu, Xiaoyu and Si, Chen and Giustino, Feliciano and Duan, Wenhui},
month = jul,
year = {2019},
note = {Publisher: American Chemical Society},
pages = {4076--4081},
}
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