Coupled ferroelectricity and superconductivity in bilayer Td-MoTe2

Apoorv Jindal, Amartyajyoti Saha, Zizhong Li, Takashi Taniguchi, Kenji Watanabe, James C. Hone, Turan Birol, Rafael M. Fernandes, Cory R. Dean, Abhay N. Pasupathy () and Daniel A. Rhodes ()
Additional contact information
Apoorv Jindal: Columbia University
Amartyajyoti Saha: University of Minnesota
Zizhong Li: University of Wisconsin
Takashi Taniguchi: National Institute for Materials Science
Kenji Watanabe: National Institute for Materials Science
James C. Hone: Columbia University
Turan Birol: University of Minnesota
Rafael M. Fernandes: University of Minnesota
Cory R. Dean: Columbia University
Abhay N. Pasupathy: Columbia University
Daniel A. Rhodes: University of Wisconsin

Nature, 2023, vol. 613, issue 7942, 48-52

Abstract: Abstract Achieving electrostatic control of quantum phases is at the frontier of condensed matter research. Recent investigations have revealed superconductivity tunable by electrostatic doping in twisted graphene heterostructures and in two-dimensional semimetals such as WTe2 (refs. 1–5). Some of these systems have a polar crystal structure that gives rise to ferroelectricity, in which the interlayer polarization exhibits bistability driven by external electric fields6–8. Here we show that bilayer Td-MoTe2 simultaneously exhibits ferroelectric switching and superconductivity. Notably, a field-driven, first-order superconductor-to-normal transition is observed at its ferroelectric transition. Bilayer Td-MoTe2 also has a maximum in its superconducting transition temperature (Tc) as a function of carrier density and temperature, allowing independent control of the superconducting state as a function of both doping and polarization. We find that the maximum Tc is concomitant with compensated electron and hole carrier densities and vanishes when one of the Fermi pockets disappears with doping. We argue that this unusual polarization-sensitive two-dimensional superconductor is driven by an interband pairing interaction associated with nearly nested electron and hole Fermi pockets.

Date: 2023
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DOI: 10.1038/s41586-022-05521-3

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