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Past Events
JITCP Seminar: Fractional Chern Insulators in Topological Flat Bands (Organized by the HKU-UCAS Joint Institute of Theoretical and Computational Physics)
| Speaker: | Dr. Zhao LIU |
| Affiliation: | Physics Department, Zhejiang University |
| Date: | December 1, 2022 (Thursday) |
| Time: | 4:00 p.m. |
| Zoom Link: | https://hku.zoom.us/j/99429547528?pwd=MjV5eWhnSjNNWVdJZytMODdHZlNrZz09 Meeting ID: 994 2954 7528 Password: 25600 |
Abstract
Fractional Chern insulators (FCIs) generalize the conventional fractional quantum Hall effect (FQHE) from continuum two-dimensional (2D) electron gases to lattice setups. They typically arise when a nearly flat 2D Bloch band with nonzero Chern number is partially occupied by strongly interacting particles. Band topology and interactions endow FCIs intrinsic topological orders. Since in principle FCIs can exist at zero magnetic field and be protected by a large energy gap, they provide a potentially experimentally more accessible avenue for observing and harnessing FQHE phenomena. Moreover, the interplay between FCIs and lattice-specific effects poses new theoretical challenges. In this talk, I will give a general introduction of FCIs, and present our recent results on FCIs in moire materials. We find topological flat bands in moire materials such as magic-angle twisted bilayer graphene are indeed a remarkably versatile platform for realizing FCIs and studying the intriguing interplay between topology, geometry, and interactions.
Anyone interested is welcome to attend.