Comet Calendar

An Electronic Chord with Three Beating Notes of Graphene

When two pieces of graphene are stacked on top of each other with a small twist-angle, a periodical beating patterns arises on a scale much larger than the original lattice, referred to as a moire superlattice. As the twist angle approaches ~1.08o, electrons are encouraged to collaborate with each other for novel superconductivity and correlated insulating states. In this talk, we add one more graphene to make a triad [1]. The beating pattern of top and middle layer forms one moire superlattice, while the bottom and middle layer form another. The two superlattices compete in dictating the electron behavior, collaborate in forming a higher order moire of moire superlattices, and facilitate correlation among an extremely low density of electrons. Towards further understanding the rich underlying physics, we will also discuss our recent effort in manipulating electrons with gate-defined nanostructure, at a length scale comparable to the superlattices.
[1] X. Zhang*, K. Tsai*, Z. Zhu, W. Ren, Y. Luo, S. Carr, M. Luskin, E. Kaxiras, K. Wang, Phys. Rev. Lett. 127, 166802 (2021).
 

Speaker Bio: Ke Wang obtained his undergraduate degree in Physics from University of Science and Technology of China and his Ph.D. in Physics from Princeton University. After his post-doctoral position at Harvard University, he joined University of Minnesota as an assistant Professor in Physics in 2018. His current research interests include correlated electrons at the quantum limit and transport properties of novel 2D functional materials and nanostructures. Ke Wang is recipient of NSF career award and International Union of Pure and Applied Physics Young Scientist Prize. 

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