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Experimental advances in the fabrication and characterization of few-layermaterials stacked at a relative twist of small angle have recently shown theemergence of flat energy bands. As a consequence electron interactions becomerelevant, providing inroads into the physics of strongly correlatedtwo-dimensional systems. Here, we demonstrate by combining large scale abinitio simulations with numerically exact strong correlation approaches that aneffective one-dimensional system emerges upon stacking two twisted sheets ofGeSe, in marked contrast to all Moir\'e systems studied so far. This not onlyallows to study the necessarily collective nature of excitations in onedimension, but can also serve as a promising platform to scrutinize thecrossover from two to one dimension in a controlled setup by varying the twistangle, which provides an intriguing benchmark with respect to theory. We thusestablish twisted bilayer GeSe as an intriguing inroad into the stronglycorrelated physics of low-dimensional systems.

One-dimensional flat bands in twisted bilayer germanium selenide