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Pages 45-52

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From page 45...
... Indeed, he added, even in magic-angle twisted bilayer graphene, people have suggested it may be possible to establish particular chemical links in a moiré structure to, for instance, stabilize an angle. Given all these possibilities, he suggested that researcher might want to explore twisted structures made with metal-organic frameworks.
From page 46...
... Pivoting from characterization tools to computational tools, Checkelsky asked Cano and Vishwanath about any analytical or computational tools that need to be developed in order to advance the field. Cano replied that one of the major chal lenges in the area is the ab initio calculation of band structures because the unit cells are so big.
From page 47...
... Jarillo-Herrero answered that magic-angle twisted bilayer graphene exhibits characteristics that are normally seen only in much more complex systems. "This is about as simple as it gets -- just carbon, and its graphene on top of graphene," he said.
From page 48...
... Cano added that tunable correlation strength is unique to this platform because usually when researchers are looking for spin liquid candidates, they are working with a phase diagram where each point represents an individual material that has been synthesized and tested, and adding points to the phase diagram means synthesizing and measuring new sample, while the tunable correlation strength of twisted bilayer graphene makes it possible to explore a large phase diagram within one material. "I think that's one of the things that makes this platform really unique for exploring fundamental physics," she said.
From page 49...
... 2018. "Autonomous Robotic Searching and Assembly of Two-Dimensional Crystals to Build van der Waals Superlattices." Nature Communications 9:1413.
From page 50...
... FCGT: A POLAR MAGNETIC METAL Before speaking about correlated oxides, though, Ramesh began with what he called an "exotic example" of a van der Waals–bonded transition metal dichalcogenide (TMD) : the compound Fe5–xCoxGeTe2, or FCGT for short.
From page 51...
... Shao, R Chen, et al., 2022, "A Room Temperature Polar Magnetic Metal," Physical Review Materials 6:044403, https://doi.org/10.1103/ PhysRevMaterials.6.044403, © 2022 by the American Physical Society.
From page 52...
... When a thin sample of the AA' structure is examined straight on, with no tilt and no magnetic field, the sample looks uniform, with no contrast. When it is tilted at about 18 degrees, however, domain contrast starts to appear, and then when a small magnetic field is applied, skyrmions start to appear.


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