Novel magnetic ordering and the magnon-induced singularity in twisted bilayer graphene
By integrating the concepts of Luttinger liquid physics and Kondo physics, Dr. Yung-Yeh Chang, Mr. Kazuma Saito and Dr. Chen-Hsuan Hsu at the Institute of Physics predict the formation of a spatially coherent two-dimensional spin helix state and, for the first time, reveal a magnon-induced singularity in twisted bilayer graphene. This novel quantum phase and its singularity can be tuned by electric fields or twist angle, and can be detected through magnetic resonance and paramagnetic susceptibility measurements. The results deepen our understanding of strongly correlated electron systems and provide new insights into similar correlated phenomena in a broader class of twisted van der Waals structures. The research has been published in Physical Review Research as a Letter.
Journal Links: https://link.aps.org/doi/10.1103/h5sd-v51h