Eshelby-twisted 3D moire superlattices
Zhigang Song (1), Xiaotian Sun (2), Lin-Wang Wang (1) ((1), Computational Research Division, Lawrence Berkeley National Laboratory,, Berkeley, CA 94720, USA (2) College of Chemistry, Chemical Engineering,, and Henan Key Laboratory of Function- Oriented Porous Materials, Luoyang
TL;DR
This paper explores the unique optical and electronic phenomena in 3D moiré superlattices caused by Eshelby twist, revealing potential for chirality-specific material design without magnetic fields.
Contribution
It introduces the concept of Eshelby-twisted 3D moiré superlattices and demonstrates their chirality-dependent optical and electronic properties through first-principles calculations.
Findings
Helical rotation induces optical circular dichroism.
Chirality-specific nonlinear Hall effect observed.
Phenomena are reversible by changing structural chirality.
Abstract
Twisted bilayers of van der Waals materials have recently attracted great attention due to their tunable strongly correlated phenomena. Here, we investigate the chirality-specific physics in 3D moir\'e superlattices induced by Eshelby twist. Our direct DFT calculations reveal helical rotation leads to optical circular dichroism, and chirality-specific nonlinear Hall effect, even though there is no magnetization or magnetic field. Both these phenomena can be reversed by changing the structural chirality. This provides a way to constructing chirality-specific materials.
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Taxonomy
TopicsQuantum and electron transport phenomena · Topological Materials and Phenomena · Mechanical and Optical Resonators