Self-doped flat band and spin-triplet superconductivity in monolayer 1T-TaSe 2- x Te x .

Autor: Phillips J; Departamento de Física Aplicada, Universidade de Santiago de Compostela, E-15782 Campus Sur s/n, Santiago de Compostela, Spain.; Instituto de Materiais iMATUS, Universidade de Santiago de Compostela, E-15782 Campus Sur s/n, Santiago de Compostela, Spain., Lado JL; Department of Applied Physics, Aalto University, 02150 Espoo, Finland., Pardo V; Departamento de Física Aplicada, Universidade de Santiago de Compostela, E-15782 Campus Sur s/n, Santiago de Compostela, Spain.; Instituto de Materiais iMATUS, Universidade de Santiago de Compostela, E-15782 Campus Sur s/n, Santiago de Compostela, Spain., Fumega AO; Department of Applied Physics, Aalto University, 02150 Espoo, Finland.
Jazyk: angličtina
Zdroj: Journal of physics. Condensed matter : an Institute of Physics journal [J Phys Condens Matter] 2024 Jun 27; Vol. 36 (38). Date of Electronic Publication: 2024 Jun 27.
DOI: 10.1088/1361-648X/ad5946
Abstrakt: 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 TaS 2 and TaSe 2 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-xTe x system produces a transition from the magnetic insulator to a non-magnetic metal in which the flat band gets doped away from half-filling. Forx∈[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-xTe x as a promising platform for correlated flat band physics leading to unconventional superconducting states.
(Creative Commons Attribution license.)
Databáze: MEDLINE
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