Correlated Electrons in van der Waals Superlattices: Control and Understanding

The interplay of electronic correlations, lattice degrees of freedom and topology holds the promise for the realization of exotic states of quantum matter. Here, we discuss routes to understand and control this interplay in van der Waals superlattice systems. The nature of superconducting order presents a recurring overarching open question in this context. We will first address doping fingerprints of superconductivity arising from spin and lattice fluctuations in moiré superlattice systems [1]. We will show how doping-dependent measurements of the superconducting transition temperature provide direct access to probing the superconducting pairing mechanism in twisted Van der Waals materials. We will then analyze possibilities of Coulomb and superlattice engineering in these systems. We will discuss confinement and deconfinement [2] pathways to create correlated Dirac fermions in stacks of transition metal dichalcogenides and identify knobs to control topology, electron correlations and emergent order in these systems.<br/>[1] N. Witt, J. M. Pizarro, T. Nomoto, R. Arita, T. O. Wehling, arXiv:2108.01121 (2021).<br/>[2] J. M. Pizarro, S. Adler, K. Zantout, T. Mertz, P. Barone, R. Valentí, G. Sangiovanni, T. O. Wehling, npj Quantum Materials 5, 79 (2020).