Applied Physics/Physics Colloquium: Long Ju - "Emergent Phenomena in Crystalline Multilayer Graphene"

Tue April 30th 2024, 3:30pm
Event Sponsor
Applied Physics/Physics Colloquium
Department of Physics
Hewlett Teaching Center
370 Jane Stanford Way, Stanford, CA 94305

Condensed matter physics has witnessed emergent quantum phenomena driven by electron correlation and topology. Such phenomena have been mostly observed in conventional crystalline materials where flat electronic bands are available. In recent years, moiré superlattices built upon two-dimensional (2D) materials emerged as a new platform to engineer and study electron correlation and topology. In this talk, I will introduce a family of synthetic quantum materials, based on crystalline multilayer graphene, as a new platform to engineer and study emergent phenomena driven by many-body interactions. This system hosts flat-bands in highly ordered conventional crystalline materials and dresses them with proximity effects enabled by rich structures in 2D van der Waals heterostructures. As a result, a rich spectrum of emergent phenomena including correlated insulators, spin/valley-polarized metals, integer and fractional quantum anomalous Hall effects, as well as superconductivities have been observed in our experiments. I will also discuss the implications of these observations for topological quantum computation.



[1] Han, T., Lu, Z., Scuri, G. et al. Nat. Nanotechnol. 19, 181–187 (2024).

[2] Han, T., Lu, Z., Scuri, G. et al. Nature 623, 41–47 (2023). 

[3] Han, T., Lu, Z., Yao, Y. et al. Science in press. arXiv preprint arXiv:2310.17483 (2023).

[4] Lu, Z., Han, T., Yao, Y. et al.  Nature 626, 759–764 (2024).

[5] Yang, J., Chen, G., Han, T. et al. Science, 375(6586), pp.1295-1299. (2022)