Tunable superconductivity coexisting with the anomalous Hall effect in 1T'-WS2
arXiv:2501.05980 · doi:10.1038/s41467-025-56919-2
Abstract
Transition metal dichalcogenides are a family of quasi-two-dimensional materials that display a high technological potential due to their wide range of electronic ground states, e.g., from superconducting to semiconducting, depending on the chemical composition, crystal structure, or electrostatic doping. Here, we unveil that by tuning a single parameter, the hydrostatic pressure P, a cascade of electronic phase transitions can be induced in the few-layer transition metal dichalcogenide 1T'-WS2, including superconducting, topological, and anomalous Hall effect phases. Specifically, as P increases, we observe a dual phase transition: the suppression of superconductivity with the concomitant emergence of an anomalous Hall effect at P=1.15 GPa. Remarkably, upon further increasing the pressure above 1.6 GPa, we uncover a reentrant superconducting state that emerges out of a state still exhibiting an anomalous Hall effect. This superconducting state shows a marked increase in superconducting anisotropy with respect to the phase observed at ambient pressure, suggesting a different superconducting state with a distinct pairing symmetry. Via first-principles calculations, we demonstrate that the system concomitantly transitions into a strong topological phase with markedly different band orbital characters and Fermi surfaces contributing to the superconductivity. These findings position 1T'-WS2 as a unique, tunable superconductor, wherein superconductivity, anomalous transport, and band features can be tuned through the application of moderate pressures.
References in corpus (21)
- Magic-angle graphene superlattices: a new platform for unconventional superconductivity
- Correlated Insulator Behaviour at Half-Filling in Magic Angle Graphene Superlattices
- Tuning superconductivity in twisted bilayer graphene
- Emergent ferromagnetism near three-quarters filling in twisted bilayer graphene
- Superconductors, Orbital Magnets, and Correlated States in Magic Angle Bilayer Graphene
- Intrinsic quantized anomalous Hall effect in a moiré heterostructure
- Optical detection of Mott and generalized Wigner crystal states in WSe2/WS2 moiré superlattices
- Observation of Fractionally Quantized Anomalous Hall Effect
- Abundance of correlated insulating states at fractional fillings of WSe/WS moiré superlattices
- Evidence of Gate-Tunable Mott Insulator in Trilayer Graphene-Boron Nitride Moiré Superlattice
- Magic in twisted transition metal dichalcogenide bilayers
- Flat bands in twisted bilayer transition metal dichalcogenides
- Observation of fractional Chern insulators in a van der Waals heterostructure
- Stripe phases in WSe2/WS2 moiré superlattices
- Deep moiré potentials in twisted transition metal dichalcogenide bilayers
- Hidden low-temperature magnetic order revealed through magnetotransport in monolayer CrSBr
- Coexistence of Intrinsic Superconductivity and Topological Insulator State in Monoclinic Phase WS2
- Observation of Topological Superconductivity in a Stoichiometric Transition Metal Dichalcogenide 2M-WS2
- Nodeless Superconductivity and its Evolution with Pressure in the Layered Dirac Semimetal 2M-WS_2
- Direct observation of topological surface state in the topological superconductor 2M-WS2
- Anomalously high supercurrent density in a two-dimensional topological material