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HL: Fachverband Halbleiterphysik
HL 8: 2D Materials II (joint session HL/CPP)
HL 8.7: Talk
Monday, March 27, 2023, 16:45–17:00, POT 81
Correlated states of moiré interlayer excitons in twisted transition metal dichalcogenide heterostructures — •Nils-Erik Schütte1, Niclas Götting1,2, Frederik Lohof1,2, and Christopher Gies1,2 — 1Institute for Theoretical Physics, University of Bremen, Bremen — 2Bremen Center for Computational Material Science, University of Bremen, Bremen
Stacking two transition metal dichalcogenide (TMD) monolayers on top of each other with a small relative twist yields a moiré pattern with a long lattice period. Quasiparticles perceive the resulting band-structure modulation as a potential landscape, making it possible to consider moiré heterostructures as a realization of a Bose-Hubbard model in a semiconductor material.
We address the question in how far correlated states of moiré excitons can emerge and study their phase transition behavior in relation to the twist angle between both monolayers. Expanding on previous results [1], we discuss the effect of nearest-neighbor interaction that gives rise to a variety of different phases, such as inhomogeneous insulating and supersolid phases. Special attention is paid to the possibility of local atomic reconstructions that are now known to occur at small twist angles.
[1] Götting et al., Phys. Rev. B 105, 165419 (2022)