Self-doped flat band and spin-triplet superconductivity in monolayer 1T-TaSe2−xTex
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2024-06-27
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en
Pages
7
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Journal of physics: Condensed matter, Volume 36, issue 38, pp. 1-7
Abstract
Two-dimensional van der Waals materials have become an established platform to engineer flat bands which can lead to strongly-correlated emergent phenomena. In particular, the family of Ta dichalcogenides in the 1T phase presents a star-of-David charge density wave that creates a flat band at the Fermi level. For TaS2 and TaSe2 this flat band is at half filling leading to a magnetic insulating phase. In this work, we theoretically demonstrate that ligand substitution in the TaSe2−xTex system produces a transition from the magnetic insulator to a non-magnetic metal in which the flat band gets doped away from half-filling. For x ∈ [0.846, 1.231] the spin-polarized flat band is self-doped and the system becomes a magnetic metal. In this regime, we show that attractive interactions promote three different spin-triplet superconducting phases as a function of x, corresponding to a nodal f-wave and two topologically-different chiral p-wave superconducting phases. Our results establish monolayer TaSe2−xTex as a promising platform for correlated flat band physics leading to unconventional superconducting states.Description
Keywords
unconventional superconductivity, magnetism, charge density wave, ligand substitution, flat band
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Citation
Phillips, J, Lado, J, Pardo, V & Otero Fumega, A 2024, ' Self-doped flat band and spin-triplet superconductivity in monolayer 1T-TaSe2−xTex ', Journal of physics: Condensed matter, vol. 36, no. 38, 385804, pp. 1-7 . https://doi.org/10.1088/1361-648X/ad5946