Terahertz light helps gain insights into he hidden quantum structure of 'magic angle' twisted bilayer graphene
An international team of researchers, including ones from ICFO, MIT, RWTH Aachen University and others, has used terahertz light to explore exotic phenomena within magic-angle twisted bilayer graphene. This approach revealed previously unseen behaviors and provided direct insights into the quantum geometry of electronic wavefunctions —the fundamental framework underlying these phenomena.
It has been less than ten years since scientists placed two graphene layers on top of each other, twisted them exactly 1.1º and observed the emergence of exotic phenomena like superconductivity and topological phases of matter. The unlocked new physics attracted great attention among the community, and the whole system soon became known as “magic-angle twisted bilayer graphene”. This magic-angle has been extensively studied ever since with most efforts focused on understanding how electron interactions lead to such exotic collective quantum phases. However, electrons at the single-particle level have also been predicted to exhibit intriguing quantum behaviors underscored by the geometry of their wavefunctions – their quantum geometry. Yet, observing these behaviors has proven challenging.
Source: https://www.graphene-info.com/terahertz-light-helps-gain-insights-he-hidden-quantum-structure-magic-angle
