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Synthesizing Coulombic superconductivity in van der Waals bilayers

Author(s)
Fatemi, Valla; Ruhman, Yehonatan
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Abstract
Synthesizing a polarizable environment surrounding a low-dimensional metal to generate superconductivity is a simple theoretical idea that still awaits a convincing experimental realization. The challenging requirements are satisfied in a metallic bilayer when the ratio between the Fermi velocities is small and both metals have a similar, low carrier density. In this case, the slower electron gas acts as a retarded polarizable medium (a “dielectric” environment) for the faster metal. Here we show that this concept is naturally optimized for the case of an atomically thin bilayer consisting of a Dirac semimetal (e.g., graphene) placed in atomic-scale proximity to a doped semiconducting transition metal dichalcogenide (e.g., WSe[subscript 2]). The superconducting transition temperature that arises from the dynamically screened Coulomb repulsion is computed using the linearized Eliashberg equation. In the case of graphene on WSe[subscript 2], we find that T[subscript c] can exceed 100 mK, and it increases further when the Dirac valley degeneracy is reduced. Thus, we argue that suspended van der Waals bilayers are in a unique position to realize experimentally this long-anticipated theoretical concept.
Date issued
2018-09
URI
http://hdl.handle.net/1721.1/118163
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Physical Review B
Publisher
American Physical Society
Citation
Fatemi, Valla and Jonathan Ruhman et al. "Synthesizing Coulombic superconductivity in van der Waals bilayers." Physical Review B 98, 9 (September 2018): 904517 © 2018 American Physical Society
Version: Final published version
ISSN
2469-9950
2469-9969

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