Tunable devices from moiré superlattices

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Recent advancements in the fabrication and manipulation of two-dimensional (2D) materials have opened new frontiers in condensed matter physics and nanoelectronics. The ability to isolate and stack atomically thin layers with precise control has led to the discovery of novel mesoscopic quantum phenomena. In particular, 2D layers stacked with a twist in their relative orientation, referred to as moiré materials due to the emerging moiré pattern they manifest, have shown a plethora of highly-correlated phenomena and unconventional physics. Twisted heterostructures made of multilayers of graphene, transition metal dichalcogenides, black phosphorus, and other 2D materials bound via van der Waals forces, exhibit remarkable optoelectronic and magnetic properties, such as non-trivial topological phases (including the magnetic skyrmionic phase), and various unconventional correlated phases (such as: superconducting, Mott insulating, Néel antiferromagnetic and itinerant ferromagnetic depending on the moiré band filling). In addition, the physical properties of moiré materials are highly tunable through various parameters, for instance electric fields, strain, doping, and manipulation of relative layer orientation. The capacity to finely tune the physical properties of such systems offers a plethora of possible applications for fundamental research in condensed matter physics and shows interesting functionalities that might be utilized in future technologies. This lecture explores the essential physical properties of moiré materials, as well as the prospects of tunable optoelectronic and magnetic devices based on moiré superlattices.

The lecture will be on-site in room 203. ZOOM transmission will be available too.

Zoom information.