A New Twist in the Realization of One-Dimensional Physics
D. M. Kennes, L. Xian, M. Claassen, and A. Rubio
Received Date: 18th June 19
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 [1-5]. As a consequence electron-interactions be-come relevant, providing new insights into strongly correlated two-dimensionalphysics. Here, we demonstrate by combining large scale ab initio simulationswith numerically exact strong correlation approaches that an effective one-dimensional system emerges upon stacking two twisted sheets of GeSe, in markedcontrast to Moiré systems studied before. This not only allows to study the nec-essarily collective nature of excitations in one dimension, but can also serve asa promising platform to scrutinize the crossover from two to one dimension in acontrolled setup by varying the twist angle, which provides a novel benchmarkto the theory. We thus establish twisted bilayer GeSe as an intriguing inroadinto the strongly correlated physics of low-dimensional systems.
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This is an abstract of a preprint hosted on an independent third party site. It has not been peer reviewed but is currently under consideration at Nature Communications.