SKM 2021 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 17: Charge Density Wave Materials
TT 17.2: Talk
Thursday, September 30, 2021, 10:15–10:30, H6
Doping fingerprints of spin and lattice fluctuations in moiré superlattice systems — •Niklas Witt1, José Pizarro1, Takuya Nomoto2, Ryotaro Arita2, and Tim Wehling1 — 1Universität Bremen — 2University of Tokyo
Twisted van der Waals materials open up novel avenues to control electronic correlation and topological effects. These systems contain the unprecedented possibility to precisely tune strong correlations, topology, magnetism, nematicity, and superconductivity with an external non-invasive electrostatic doping. By doing so, rich phase diagrams featuring an interplay of different states of correlated quantum matter can be unveiled. The nature of the superconducting order presents a recurring overarching open question in this context.
In this work, we quantitatively assess the case of spin-fluctuation-mediated pairing for Γ-valley twisted transition metal dichalcogenide homobilayers. We construct a low-energy honeycomb model on which basis we self-consistently and dynamically calculate a doping dependent phase diagram for the superconducting transition temperature Tc. A superconducting dome emerges with a maximal Tc ≈ 0.1-1 K depending on twist angle. We qualitatively compare our results with conventional phonon-mediated superconductivity and discern clear fingerprints which are detectable in doping-dependent measurements of the superconducting transition temperature, providing direct access to probing the superconducting pairing mechanism in twisted Van der Waals materials.