26ème Congrès Général de la SFP

Misfit layer compounds as ultra-tunable field effect transistors: from charge transfer control to emergent superconductivity

7 juil. 2023, 10:15

15m

Amphi Gaston Berger

Contribution orale MC21 Matériaux quantiques : des prédictions à l'observation Mini-colloques: MC21 Matériaux quantiques : des prédictions à l'observation

Orateur

Ludovica Zullo (Sorbonne Université and Università degli studi di Trento)

Description

Misfit layer compounds are heterostructures composed of bilayer rocksalts stacked with few layers transition metal dichalcogenides. They host Ising superconductivity, charge density waves and good thermoelectricity. The design of misfits emergent properties is, however, hindered by the lack of a global understanding of the electronic transfer among the constituents. Here, by performing first principles calculations, we unveil the mechanism controlling the charge transfer and demonstrate that rocksalt bilayers are always donor and dichalcogenides acceptors. We show that misfits behave as a periodic arrangement of ultra-tunable field effect transistors where chargings as large as $\approx 5\times {10}^{14}$ e${}^{-}$cm${}^{-2}$ can be reached and controlled efficiently by the La-Pb alloying in the rocksalt. Finally, we identify a strategy to design emergent superconductivity and demonstrate its applicability in (LaSe)${}_{1.27}$(SnSe${}_2$)${}_2$. Our work paves the way to the synthesis and design of misfit compounds with tailored properties.

Documents de présentation

Misfit layer compounds as Ultra-Tunable Field Effect Transistors From Charge Transfer Control to Emergent Superconductivity.pdf