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Coupled Ferroelectricity and Superconductivity in Bilayer $T_d$-MoTe$_2$
- Publication Year :
- 2023
- Publisher :
- arXiv, 2023.
-
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 (2D) semimetals such as WTe$_2$. 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 fields. Here we show that bilayer $T_d$-MoTe$_2$ simultaneously exhibits ferroelectric switching and superconductivity. Remarkably, a field-driven, first-order superconductor-to-normal transition is observed at its ferroelectric transition. Bilayer $T_d$-MoTe$_2$ also has a maximum in its superconducting transition temperature ($T_\textrm{c}$) 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 $T_\textrm{c}$ 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 2D superconductor is driven by an interband pairing interaction associated with nearly nested electron and hole Fermi pockets.
- Subjects :
- Superconductivity (cond-mat.supr-con)
Condensed Matter - Materials Science
Multidisciplinary
Condensed Matter - Mesoscale and Nanoscale Physics
Condensed Matter - Superconductivity
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
Materials Science (cond-mat.mtrl-sci)
FOS: Physical sciences
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....8123f70392897a4ffc9b5dc6adcff807
- Full Text :
- https://doi.org/10.48550/arxiv.2304.05443