Frontiers in Synthetic Moiré Quantum Matter Proceedings of a Workshop (2022) / Chapter Skim
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7 Topological Superconductivity in Twisted Cuprate Double Layers
7 Topological Superconductivity in Twisted Cuprate Double Layers
Pages 53-61
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From page 53... ...
Similarly spin–orbit coupling can lead to some very exotic phases, which is of great current interest in topological insulators.
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From page 54... ...
, ferromagnets (SrRuO3) , topological insulators (Y2Ir2O7)
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C o r r e l at e d O x i d e s 55 oxides -- has led to the discovery of a large number of unexpected behaviors in the materials, and Ramesh described a number of interesting behaviors in atomically perfect oxide superlattices in this portion of his talk. Referring back to his comment that complex oxides have a strong coupling among the lattice, charge, orbital, and spin degrees of freedom, he said, "You can bring all of them together." The key to the resulting interesting behaviors, he said, can be found at the boundaries between layers of different oxide materials in a superlattice.
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From page 56... ...
56 Frontiers in S y n t h e t i c M o i r é Q ua n t u m M at t e r vortices alternate rotating left and rotating right in domains which are about as wide as the lead titanate layer is thick (Das et al. 2019; Yadav et al.
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C o r r e l at e d O x i d e s 57 FIGURE 5-2 Polar textures in a lead titanate/strontium titanate superlattice. SOURCE: Ramamoorthy Ramesh, University of California, Berkeley, presentation to the workshop, May 19, 2021; reprinted by permission from Springer Nature: A.K.
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From page 58... ...
In work done in collaboration with researchers at Argonne National Labora tory, Ramesh and the others used ultrafast light to manipulate the vortices, making them "coherently jiggle around." They are coherent modes of the vortices, he said, with the entire vortex going up and down. This collective motion of the vortex has been named the "vortexon." In a different direction, theoretical calculations have indicated that by varying the substrate on which the lead titanate is deposited, one varies the strain between the two layers, which in turn varies the sorts of behaviors one observes.
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From page 59... ...
"We still need to learn how to make this interfaces, but this is indeed a huge opportunity." DISCUSSION After Ramesh's presentation there was a short question-and-answer period moderated by Aharon Kapitulnik. One question concerned the possibility of grow ing oxides between layered two-dimensional materials.
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From page 60... ...
60 Frontiers in S y n t h e t i c M o i r é Q ua n t u m M at t e r Kapitulnik then asked his own question, beginning with the observation that speakers during the workshop's first day had talked about the possibility of three dimensional moiré patterns in some of the TMD materials. Given that Ramesh had said that people are only in the very beginning of obtaining moiré patterns in the growth direction of thin films, wouldn't it be easier now to create moiré patterns in the third dimension, that is, at the interface of domain walls?
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From page 61... ...
6 Slicing and Alloying Halide Perovskites Following Ramamoorthy Ramesh, Hemamala Karunadasa of Stanford University continued by describing systems that might be used to create new moiré quantum materials. Karunadasa, a synthetic chemist, described halide perovskites and how single layers of those materials can be created and put to use in creating new materials with interesting properties.
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