Abstract
Bilayers of two-dimensional materials twisted at specific angles can exhibit exceptional properties such as the occurrence of unconventional superconductivity in twisted graphene. We demonstrate here that novel phenomena in twisted materials emerges also in particle-based classical systems. We study the transport of magnetic colloidal particles driven by a drift force and located between two twisted periodic magnetic patterns with either hexagonal or square symmetry. The magnetic potential generated by patterns twisted at specific magic angles develops flat channels, which increase the mobility of the colloidal particles compared to that in single patterns. We characterize the effect of the temperature and that of the magnitude of the drift force on the colloidal mobility. The transport is more enhanced in square than in hexagonal twisted patterns. Our work extends twistronics to classical soft matter systems with potential applications to lab-on-a-chip devices.
Highlights
Bilayers of two-dimensional materials twisted at specific angles can exhibit exceptional properties such as the occurrence of unconventional superconductivity in twisted graphene
We extend here twistronics to a classical, particle-based, system made of magnetic colloidal particles that are located between two periodic magnetic patterns and are driven by a weak drift force
A partial destructive interference between the magnetic fields of the patterns generates flat channels in the total magnetic potential which results in enhanced long-range anisotropic colloidal transport
Summary
Bilayers of two-dimensional materials twisted at specific angles can exhibit exceptional properties such as the occurrence of unconventional superconductivity in twisted graphene. We study the transport of magnetic colloidal particles driven by a drift force and located between two twisted periodic magnetic patterns with either hexagonal or square symmetry. 1234567890():,; The emerging field of twistronics[1] studies the properties of bilayers of two-dimensional materials that are rotated relative to each other by a twist angle. Not present in the individual monolayers, can emerge in the resulting moiré superlattices[2–4] These include superconductivity[5,6], ferromagnetism[7], and correlated insulating states[8–11] in twisted bilayer graphene. A partial destructive interference between the magnetic fields of the patterns generates flat channels in the total magnetic potential which results in enhanced long-range anisotropic colloidal transport. We study with Brownian dynamics simulations the effect of the twist angle, the temperature, and the magnitude of the drift force on the mobility of the particles for both square and hexagonal twisted patterns. Our results and conclusions may apply to other twisted materials and constitute the basis for novel lab-on-a-chip applications
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